dramatic audio reveals how a british warship warned iranian forces not to seize a uk—registered oil tanker in the gulf. this is the scene live in hong kong, where tens of thousands of pro—democracy protesters have taken to the streets in the latest challenge to beijing. can irish golfer shane lowry follow his sensational round yesterday — with victory in the open at royal portrush this afternoon? and coming up. authors, jessie burton and alex wheatle, join school of life biblio—therapist, ella berthoud, to discuss the role of reading and writing within mental health. the chancellor of the exchequer, philip hammond, says he'll resign this week if borisjohnson becomes the new conservative leader and prime minister. mr hammond says he doesn't agree with mrjohnson over brexit, and thinks it's unlikely britain will get a deal agreed with the eu by the current leaving date of october 31st. here's our political correspondent, nick eardley. if there's one thing these two can agree on, it's that delivering brexit has not been an easy ride. have you got the green light? hang on. i haven't got a green light. oh, the story of my life. borisjohnson is odds on to become our prime minister on wednesday. but the chancellor can't sign up to his brexit strategy. and so this morning, live on the television, he announced he plans to quit. assuming that borisjohnson becomes the next prime minister, i understand that his conditions for serving in his government would include accepting a no deal exit on the 31st of october, that is not something i could never sign up to. it's very important that a prime minister is able to have a chancellor who is closely aligned with him in terms of policy, and i, therefore, intend to resign to theresa may before she goes to the palace to tender her own resignation on wednesday. we don't know for sure that borisjohnson will beatjeremy hunt, we'll find out on tuesday. but it is notjust the chancellor getting ready for prime ministerjohnson. others are ready to quit it too. just like theresa may, the next pm will have a divided party in parliament. they will also face a familiar issue here. the border between the republic and northern ireland. both men say they want to take out the controversial backstop, but the irish government isn't having it. if the approach of the new british prime minister is that they are going to tear up the withdrawal agreement, then i think we're in trouble. i think we're all in trouble, quite frankly, because that is a little bit like saying, "either give me what i want or i am going to burn the house down for everybody. " so no deal remains a possibility. he says it will have a significant economic impact, and mean checks on the island of ireland. but he says it will be britain's fault. not so, says mrjohnson's team. they want to prepare for leaving without a deal, but still think a new one is possible. the deal, as it stands right now is dead and there's no point in trying to fiddle or twiddle it. the reality is there are huge elements in it which simply are inoperable in the uk. the eu is a master at hard—nosed negotiations and i think we got taken for a ride. because we were not. there will be a new boss here on wednesday with their own ideas about how to get a better brexit offer. but many of the challenges will be ones we've got very used to. and nick explained why mr hammond decided to announce his resignation plans now — and what that means for the next prime minister. he is a man who has been in government since the coalition years, nine years at the heart of government. all we have seen is a safe pair of hands. fairly mild—mannered and loyal. has just dropped this bombshell on sunday morning live on television for the simple reason that he is despairing about the way that it looks like the conservative party is going to go, under borisjohnson. he thinks that no—deal brexit would be a calamity and is not prepared to sit back and watch it happen. there is an element of being pushed before, sorry, jumping before he was pushed. for the simple reason he was not going to stay in his cabinet anyway. the same was true for some other cabinet members. but they are trying to get out with a maximum impact to say to borisjohnson that the we think you're getting this wrong. there are rumours we could see more people leaving, stepping down. what is not going to do to boris's working majority? we will certainly see more ministers refusing to serve under boris johnson, we know thejustice secretary is one of them and there could be one or two more cabinet ministers who say they will not serve. morejunior ministers on top of that. the big challenge will come if, as you say, people decide to actually leave the conservative party and eat away at his working majority. a government and he could be in a situation in the next few weeks where a working majority is ebbing away. there is the wales by—election next week which again the conservatives could lose a seat and that wafer thin working majority could be even slimmer. what does it point to? it points to borisjohnson finding the first few months of government extremely hard, all working towards that 31st of october date and he has to somehow convince parliament to get on board. we are hearing from simon to add to that increasing and very busy in tray. remind us what he was saying. he has the same challenges theresa may faces, a rebellious conservative party and a parliament divided over brexit but european union holding firm. so far there is no sign that there is no europe wants to reconsider the backstop, well it to do it some point in the face of a no deal? possibly, but at the moment, there is no sign of that. if you does when borisjohnson will enter downing street struggling to see how we will get something through parliament. even the europe says yes we want to sort something out and be a friend, we're not going back on the withdrawal agreement so there is a to do. the owners of the british—flagged tanker seized by iran on friday says they've put in a formal request to visit the crew members who were captured. the stena impero has been impounded with all 23 crew aboard in the port of bandar abbas. meanwhile, a recording has emerged of radio exchanges between a royal navy warship and iran's revolutionary guard — moments before the tanker — the ‘stena impero' — was seized in the strait of hormuz on friday. iran's ambassador to the uk, says any further escalation of tensions between britain and iran would be ‘unwise and dangerous'. daniala relph reports. the radio messages came ahead of the iranian revolutionary guard taking over the stena impero, descending from a helicopter to the deck of the tanker. a british warship, hms montrose, had been alerted, but failed to reach the ship on time. it did, though, embark on a radio exchange with an iranian patrol boat. the swedish—based owners of the tanker insist the vessel did not breach any regulations. it says its priority is protecting its multinational crew. translation: we followed the ship every second and every minute and the tanker never left international waters. we understand that the crew are in relatively good condition, but it's a stress situation for everyone. the british government says it is now looking to its international allies to help ease the tension. our first and most important responsibility is to make sure that we get a solution to the issue to do with the current ship. make sure other british flagged ships are safe to operate in those waters and then look at this wider picture of actually having a working, proper, professional relationship with iran. but this is a hostile act, let's not dodge away from that. in this deepening political and diplomatic row, there are still 23 crew members on a british flagged ship who remain prisoners of iran's revolutionary guard. daniella relph, bbc news. there have been violent clashes in hong kong following another mass rally against the authorities. the police used tear gas and pepper spray, these are live pictures. right police were called in as this protest developed. this is primarily because there was an official end point but the protesters went beyond that and so the authorities, the right police moved in. we have seen shots of plenty of smoke in the air, a mixture of tears and smoke bombs. we have had images of police charging at lines of protesters, our correspondence woke is a short time ago from the scene and this is what he told us. they are holding makeshift shields, cardboard and plastic and the like to try and repel the tear gas that the police have been firing at them. we might move on to see if we can get a better idea, they are definitely kitted up to take on the right to kitted up to take on the riot police knowing that another charge from the authorities is coming. and if we swing around to the other end of the direction we can see this bright light, that is the right bright light, that is the riot police just there, waiting to come again. and they have been pretty forceful tonight i have to say, every time they come they push everyone out of the way including reporters and other bystanders, i think that the imagery of going to beijing's headquarters, spray—painting it, even writing graffiti along the lines that the president is a dog, it was never going to take long for police to come out after that had happened and clear them away. that's exactly what has happened. quite a tense situation at the moment, bits of barricades still on the ground here, they have been thrown and various other projectors, glass, bricks and the like have been thrown at the police and the police have responded with bat on charges. police and the police have responded with baton charges. tear gas, and it will keep going like this until they managed to clear these people out of the street altogether. this has gone past the fight against the extradition bill? you described earlier chants of defending freedom is in hong kong's also give us an idea of the freedom we are talking about because many people around the world would understand the special relationship that hong kong has. exactly. this movement started off against this very unpopular extradition bill allowing for extradition to mainland chinese courts, controlled by the communist party. but people here say that other freedoms have been slowly deteriorating. they think the independence of the court has been deteriorating, free press has been deteriorating, journalists being thrown out of hong kong, for doing things the government doesn't like something which would never have happened many years ago stop so they think this could be the end of the way of life. i can hear projectiles being thrown from the site, so... you can see them preparing, they definitely know that the next charge from the police is coming very soon and that is partly because protesters are throwing projectiles at them potentially to provoke such a clash. we will very quickly take you back to hong kong, he was speaking there of the riot police getting ready to charge again. just a few seconds ago we saw the police lift a banner with a warning saying disperse or we fire will stop referring to the tear gas. that has been fired towards the protesters. you can see with those long shields that they are holding up long shields that they are holding up it would appear they are preparing now to charge towards those protesters. the protesters themselves spraying water on the roads, they have also been letting off smoke bombs and their images earlier of them shining lasers at the riot police as well. and the reason riot police were brought out onto the street was because the protesters had gone beyond the official end point of the rally and they have made the point to the main beijing headquarters and that angered authorities and we saw a return of the riot police on the streets of hong kong. watching this closely but it does look as if they are preparing their to either fire their tear gas. you can see protesters with their hard hats behind flimsy barriers, we have seen plastic shields as well but it appears that there is going to be to be tear gas fired as they have refused to disperse. the headlines on bbc news. philip hammond says he'll resign as chancellor on wednesday, if borisjohnson becomes prime minister. ireland's foreign minister warns the uk's next prime minister, that if they tear up the brexit withdrawal agreement , ‘we're all in trouble'. nato joins international criticism of iran , for seizing a british—flagged oil tanker in the gulf. sport now and for a full round up, from the bbc sport centre, here's sarah stone. good afternoon. adam peaty has become the first man to swim 100 metres breaststroke in under 57 seconds. the british swimmer broke his own world record with a time of 56.88 seconds to qualify for tomorrow's world championship final in south korea, something that he has been working hard to do. i kind ofjust estate to the ground, use my team—mates and to use it to the complete advantage. i think i am the complete advantage. i think i am the finest foreign i have ever been in and hopefully the finest person i have ever been. trying to do everything around the edge of the sport, i am everything around the edge of the sport, iam kind everything around the edge of the sport, i am kind of getting into manhood now so i am not an 18—year—old going out and splashing and dashing. this is how i set my legacy and this is how i want to do it. to the final round of the open championship now, and ireland's shane lowry continues to blaze a trail at the top of the leaderboard. let's get the latest from our reporter adam wild at royal portrush. things have brightened up somewhat. we have had the most tremendous downpour in the last half—hour or so. downpour in the last half—hour or so. conditions marginally better. it still very windy but if your name is shane lowry, it is looking very bright indeed. the irishman now six shots clear of the field here in the final round of the open championship. back to back bogeys at the eighth and ninth, he went to the turn at 36, but he has just killed another shot back for some 16 under par, tommy fleetwood the man playing behind him, six shots back, so he will have to do something special if he's going to put a charge onto shane lowry. some really huge crowds. we have seen graeme mcdowell coming in, he has not challenged the leaders back to the scenes that greeted him as he walks down the 18th where quite astonishing. he looks very moved, he is from portrush, his brother is a green keeper here. it meant so much for him to be here. he looked visibly moved, visibly shocked by the size of the crowds. the sound of the crowd as he went up the 18th. i could only imagine what it is going to be like if it shane lowry still has that lead coming down the 18th, we could be in for something very special indeed. geraint thomas has boosted his hopes of retaining his tour de france title following the fifteenth stage. the briton started the day more than two minutes behind the yellow jersey of frenchman julian alaphilippe, but surged away from him a mile from the finish. compatriot simon yates the reiging vuelta espana champion was further ahead and won the stage, but isn't in contention for the overall race. thomas finished seventh with alaphilippe 11th. his lead now cut to just over a minute and a half. there was an impressive performance by britain's dina asher smith as she finished second in the 100 metres at london's anniversary games. the 23—year—old won her heat earlier in the day with a season's best time but lost out in the final to the double olympic champion shelly—ann fraser pryce. smith finished the race in 10.92 seconds. harry kane scored a stunning winning goal in injury time as tottenham beatjuventus 3—2 in the international champions cup. kane lobbed juve keeper wojciech szczesny with a first time strike from the half way line to give spurs the win in singapore, leaving the former arsenal keeper with absolutely no chance. both kane and wojciech szczesny were able to see the funny side at full time. we had disappointment at the world cup yesterday when england lost their semifinal to new zealand, but today they have bounced back to win the bronze medal match with a fine performance against south africa. that's all the sport for now. you can keep up with the latest from the open and all today's sports news on the bbc sport website. a 15—year—old boy has been shot in coventry city centre. police say it happened last night. the teenager's injuries are said to be serious, but not life threatening. detectives are treating it as attempted murder. in portugal, at least one village has been evacuated, and more than a thousand fire fighters deployed to three separate wildfires in the castelo branco region, north of lisbon. one person has been seriously injured, as well as four firefighters. six neighbouring regions are on the maximum fire alert. british airways flights between london and cairo remain suspended until at least friday, because of what the airline has described as ‘a safety precaution'. no further details have been given. the german carrier, lufthansa, also abruptly cancelled flights to cairo yesterday , but resumed its services today. andy moore reports. (tx the last—minute cancellation of the flight to cairo caused confusion and anger at heathrow airport. one passenger, due to fly to her sister's wedding on tuesday with her husband and two children, says she now faces a huge bill to rebook. i don't know what to do. i can't even tell my sister that the flight is cancelled. my kids, they are feeling disappointed. they are very, very disappointed. i had to tell them the truth, that we don't know whether we're going to travel or not. it may be very inconvenient for some travellers, but this plane crash is the spectre that looms behind the ba cancellations. in 2015, a russianjet plunged into the sinai desert, killing all 224 passengers on board. britain was one of the first countries to warn it was most likely a terrorist attack. other nations followed the uk in stopping flights out of sharm el—sheikh. it's now thought the plane was blown up by a bomb smuggled on board at the airport. so far, the cancellations only effect ba flights to and from cairo. other british airlines flying to other destinations in egypt are not affected. but the foreign office has updated its travel advice, saying there is a heightened risk of terrorism against aviation. it's says extra security measures are in place for british planes leaving egypt. the government wants to stop companies gagging employees who want to speak out about wrong doing in the workplace. there's been growing concern about the use of non—disclosure agreeements — known as ndas — to silence staff, particularly over issues such as sexual harassment and racial discrimination. but new legislation will make it illegal for companies to use ndas to prevent staff from reporting misconduct to the police or their doctor. here's our business correspondent, katy austin. typically, signing a nondisclosure agreement, nicknamed a gagging clause, means that a parting employee gets a pay—out. but in return, can't discuss the situation publicly. ndas have been thrust into the spotlight by high—profile cases. for example, the businessmen sir philip green was accused of using them in relation to bullying and sexual harassment allegations, which he denies. ndas have various legitimate uses. they can apply to commercially sensitive details such as inventions. but there has been growing concern, including from mps, that they are sometimes being used inappropriately to cover up allegations of harassment and discrimination in the workplace. last year, theresa may promised reforms to prevent their misuse. now, the department for business says changes to the law will stop them being used to prevent people talking to police or other services about the allegations, and make sure people fully understand what they are signing, and their rights. it's also promising new measures to take action where ndas don't follow the rules. one lawyer, who has been calling for reform, says this is a start, but doesn't go far enough. the good thing is that you can tell the police, you can talk to your doctor, you can go to a lawyer. you can even talk to a priest. the problems are that very many people, in the real world, will want to talk to their nearest and dearest and this reform does not allow them to do that. a group which has campaigned against the use of ndas by universities wants a total ban. this proposed legislation is a missed opportunity to deal with ndas. we would like to see a prohibition on the use of ndas in cases of sexual misconduct, bullying and harassment. the law change is designed to tackle a perceived imbalance of power between employees and their former employers. but there is no set date for when it will come into effect. it isn'tjust the smoke from cigarettes which can damage the environment. 11.5 trillion cigarette butts are dropped across the world every year, and can take decades to break down. new research from anglia ruskin university, shows that plant growth can become stunted because of the plastic found in cigarette filters. louise hubball explains. they're the most common form of litter on the planet. and it seems cigarettes are not only bad for the environment when they're lit. and now, new research is looking at the impact they have when people throw them down onto the soil. this is a husband and wife team at anglia ruskin university, leading the study. the first of its kind. in a series of experiments, they studied how cigarette butts prevent plants from growing properly. and, by using a piece of wood as a test, showed it wasn'tjust the weight holding back the shoots. by extracting the chlorophyll from the plants and shining a light through it, you can see how healthy the plant is. and by testing all different brands of cigarette, including menthol ones, and even unsmoked ones, they came to the conclusion it was the plastic filter that was causing the problem. cigarette butts can decrease plant growth. they can decrease germination and the length of those plants in the short—term. the cigarette filter itself is made out of a bio—based plastic called cellulose acetate. and this, on its own, separately, in a different form, has been found to reduce plant growth. so we need to raise awareness that cigarette butts are not made of paper. they don't degrade quickly in the environment and they can have toxic effects on plants and animals. the plants tested were rye—grass and clover. most commonly found in urban spaces. which has big implications for us all. well, rye—grass is a very important crop, especially for cattle. they feed on it, they graze. clover is a nitrogen fixing plant. so basically, they aid in the fertilisation of the grasslands. and they also add to the nutrient content of the food. if we pollute our plants and the soils and the environments that they are in, then we're ultimately actually polluting ourselves. when they are tossed aside, cigarette butts can take up to a decade to breakdown. the scientists now want to carry out further research to see if the plants recover, after initial exposure to the plastics hidden inside. six puppies that were stolen by burglars who had machetes have been reunited with their mother, after they were found by police. they were taken by 2 men, who managed to get access to a flat in the north of manchester. when their mother, zena, you can see here, tried to defend them , she was slashed in the face. a ao—year—old man has been arrested on suspicion of aggravated burglary and remains in custody for questioning. we are going live to hong kong, these are live from the streets of hong kong and these are the riot police you can see with their shields up. just to give you the latest details, afp are reporting, they have reporter on the scene who said that they have seen riot police actually firing multiple rounds of rubber bullets at the protesters. we have also seen a lot of smoke previously in the area of the protests some of that smoke coming from smoke bombs, some actually is tear gas. you can see the media also there on the side, with those riot police. but the protesters are having to face the police because they have effectively defied an official end point. they have made their way to an official office of measuring four the police headquarters. and so the riot police that were rotten have been challenging some of the processors who have been patting eggs at that liaison office, there has also been graffiti that has been sprayed on the walls. the latest, as i said, are reports of rubber bullets that have been fired by the riot police towards the anti—government protesters who, once again, have taken to the streets this weekend. watching the situation in hong kong very closely so do stay with us. it has been a reasonable day, a lot of dry and bright conditions, but northern ireland has seen the rain come down heavily and that weather has been spreading into western scotla nd has been spreading into western scotland as well. now, tonight the rain will continue for a good chunk of the night for northern ireland and western scotland and we could see 25 to 50 millimetres of rain. perhaps as much as 100 millimetre in the hills of dumfries and galloway. the risk of some localised flooding here. a warm night with 15 the overnight low. the wind will push that rain north to the highlands and the western isles. else where, after a cloudy start for some, plenty of sunshine coming out through the afternoon and it is going to be a warm or very warm day for many areas. northern ireland, wales, eastern scotland and hot across eastern scotland and hot across eastern england with highs up to 29.