in east sussex of the forces‘ sweetheart, dame vera lynn, who died last month, at the age of a hundred and three. two spitfires flew over the funeral cortege, as it made its way through her home village of ditchling. duncan kennedy was there. it was a village that came to pay as respects, but this was a nation saying farewell. they dame vera lynn's funeral quotation passed through the streets lined by people she called her friends. through the streets lined by people she called herfriends. her daughter, virginia, walked behind the procession. traffic stop on a day for reflection. we lost one of oui’ day for reflection. we lost one of our great, you know, national treasures, really. and this is more ofa treasures, really. and this is more of a celebration to show our respect for her and what she has done for oui’ for her and what she has done for our country. she was a heroin. an absolute heroine, yes. yes. two spitfires from the memorial museum flew a bove spitfires from the memorial museum flew above the village, symbols of dame vera lynn's strong bond with the arm to armed forces. dame vera lynn's own bridge tables gave solace toa lynn's own bridge tables gave solace to a nation at war and joy to later generations as her life parked gci’oss generations as her life parked across the decades. it is a day of sadness because we have lost dame vera lynn. her death will leave a great gap in our community. of course, any whole nation, she was loved and cherished by so many people. the court has slated move to a private funeral service never brightened. her coffin was held by members of the air force, army, and needy. along the coast in dover the famous white cliffs became a campus of remembrance. a tribute to dame vera lynn. an emblem of resilience, a voice of hope, inspiration for a grateful nation. duncan kennedy on the life of dame vera lynn. now on bbc news, it's time to click. this week: healing without hospitals. building an e—bike. and would you trust an al to get you fit? that looks exhausting. welcome to click, hope you are doing 0k. now, last week, lara ventured into her garden. this week we have both been let loose into the outside world. lara, how was it for you? it was great, i have been on an electric bike and i managed to not fall off, unlike last time. how was it for you? i have to say, i really enjoyed filming out and about again. we have both done this bike thing, which you will see later in the programme. one other thing i have done this week is i have been to a comedy gig online, which was really funny. and the good thing is that the front row of the audience, if you like, had their mics live throughout, so you could hear some of the laughter which really helped, and i really enjoyed it. that sounds great, and who would want to be on the front row of a comedy gig normally? no, not me. anyway, as we start to move toward some sort of sense of normality, one of the things that was delayed during lockdown was non—emergency surgery. in england the nhs had to free up 12,000 beds for covid—i9 patients. and that meant the delay of 2 million operations. it means that people awaiting procedures like joint replacements have been left in pain and the nhs itself has been left with a huge backlog of surgeries that could reach 10 million by christmas. so how is that going to happen? and what can people do while they are waiting? here is jen copestake. trying to be the fittest old—age pensioner in the country. 80—year—old brian lewis has been waiting for a hip replacement in his home near manchester since the lockdown began. like millions of others, brian was on the list for elective surgery before coronavirus, but, since march, everything is on hold. he could cope with the pain for a few months and has been doing zoom calls with his physiotherapist, but now is finding it very difficult. it has completely from here to there, the pain hasjust been in the hip and now it is the whole leg, i have these muscles in my leg that can move, i have always been a very fit guy, like, you know, but... this excruciating pain. i have reached the stage now where the deterioration has been so great, and the last three weeks i have been put onto a stick. doctors around the country are looking at ways they can remotely assist the thousands of patients that are waiting forjoint surgeries. this includes the creation of new apps and tools that can monitor them in new and detailed ways. welcome to our lab. fantastic. whoever you are, wherever you are. this free app provides free access to some of the orthopaedic therapies and expecting could have in person. downloading this app is a great way to make recovery from your surgery. it's part of a service called my recovery that allows surgeons to monitor their patients at home. the coronavirus pandemic has accelerated the team's work to design more advanced ways to generate useful patient data for doctors. these are infrared cameras, and they are all tracking, triangulating off of these dots. so these are typically used in the computer game industry or the film industry. using datasets from analysis labs around the world, they are training algorithms on millions of data points to create a new camera system that could one day be used with a simple smartphone camera connected to the internet. this would recreate the sophistication of a fully fledged gait analysis lab in anyone's pocket, enabling a surgeon to have the ability to confidently assess a range of motion in the patient‘s near post surgery without anyone having to leave home. to create the algorithm it has to be on someone's phone, so it has to be small and unique and quick, but to make that algorithm we have to process a lot of data over a lot of years. because of the vast amounts of training the algorithm has gone through, it can accurately identify the anatomy and range of movement to a degree similar to wearing a morph suit in an expensive gait lab. we are particularly interested in human motion capture, so we've taken lots of inspiration from the gaming world. what we're doing is a very accurate version of this using artificial intelligence to accurately measurejoint function. so, for a surgeon, can this technology, through a smartphone camera, tell a surgeon if that patient‘s leg is straight after surgery? one of the hospitals advocating the use of these tools is in wrightington. birthplace of the modern hip replacement, the team here want to see more daycare surgeries to shorten the time people spend in hospital and help clear the backlog. there is an app in development, a specific version of the my recovery app, to support the day case patients. you can bottle information that may get a lot of information just by talking but in some cases you have to have a lot of examination, some system to be able to measure the range of movement of a joint, accurately, which would be of benefit. artificial intelligence could be used in other ways to clear the backlog of cases. c2 ai, an approved user of the nhs dataset, is aiming to prioritise patients based on their operative risk and physiology in order to rank them in order of priority. they have identified 14 key variables that correlate the risk of mortality and will be able to look at the whole country's surgical backlog at once. we have a version of this where we can bulk load the full elective surgery list in one go, so we can see everybody against everybody. if you had a patient, would some people feel neglected if it ai is doing this? i think people would want to know there is a logic to it, and if they are waiting behind people it is because they have a greater need. rather than being done in an inefficient manner, it is being done with a reason. there are large numbers of people on the list, with comorbidities, for example, which might mean they are at higher risk. artificial intelligence could be used to scan that data and come up with a list of patients that fit a certain category, a certain priority, rather than, you know, clerks having to go through that, or, indeed, clinicians having to go through all that data to try and prioritise patients. i think the algorithm could be more sensitive and useful than somebody, because they will do the pain thing, you know, one to ten, the old—fashioned thing. whereas the algorithm can take so many other things into account that a human being can't. brian and millions of other patients who signed up to elective surgery still have many months to wait, but using patient data and powerful computing systems can help the process and get them in and out of hospital faster. hello and welcome to the week in tech. this is the week in which a ag internet balloon service from google sister company loom was finally launched in kenya. it was announced two years ago and has been fast tracked now to keep people connected during the pandemic. facebook was heavily criticised in its own civil rights audit. the audit called on facebook to do more to tackle organised hate against minorities and religious groups. the social network said it would make some but not all of the changes recommended. a new video codec was revealed that could put an end to... well, this, basically. companies including apple, microsoft and huawei have worked on the h.266 codec which uses half as much data per video as its predecessor, so you can watch twice as many videos before your phone gets full. if you have had enough of video calls, meetings and catchups, there's a new way to get together in microsoft teams. together mode cuts everybody out of their video and put them in a virtual room. microsoft says it makes video calls feel more natural. light upgrades have been used to promote social distancing in south korea. 300 drones were used in this display above seoul, which reminded people to wear a mask, wash their hands and included message to key workers. it was not advertised in advance to avoid drawing a big crowd. here in the uk, things are opening up. but we are still being told to only get public transport when it is essential. and that has led to a surge in sales of e—bikes. the leap has been unprecedented. in may, as an example, we sold more bikes than we did in the entire year in 2018. a decent e—bike can easily cost well over £1000. and there are hundreds of brands to choose from. but the vast majority of them run on tech from just one manufacturer. the number of bosch—powered electric bikes in the uk would be somewhere between 60 and 80 percent. but the difference between e—bikes is how they are powered. some have hub drive motors which track your pedal rotations and power the bike's wheels. today though i am using an even smarter crank drive bike. this uses a torque sensor to respond to how hard i press the pedals, and this monster of a battery means it can ride up to 100 miles — not that i am planning on going that far. i've got my high—vis, i've got my hat and i have my bike, let's go. i can feel the power. this suddenly feels so light, i can't believe i am going uphill. hitting 15.5 mph - that is the legal speed limit for e—bikes in the uk — was pretty effortless, too. some countries do have higher speed limits for pedal assist bikes, but if you've seen cyclists putting in zero legwork at all, they are likely to be using a throttle system. these are less common and in most eu countries you need special registration and insurance to ride them legally. i was excited about the fact that this could go faster but i didn't think i would have the confidence to do it. actually, once i got going, the weight of it made me feel so much more confident. why do they have to be speed limited? but all this comes a pricetag. £4706. pretty shocking really. spencer has been looking at a far cheaper solution. you might like the idea of a e—bike but you may only have a perfectly nice bike already. the good news is you can retrofit your bike to make it electric using a conversion kit like this. switch is a new front wheel with a 250—watt motor in the middle. it also comes with a powerpack and a pedal sensor. this isn't cheap, but it is cheaper than an e—bike, and the price you pay is also your time, which will be dependent on how confident you are with taking off wheels, tires and brake discs. if you think you are going to get stuck then you can pre—book a support video call. obviously i only called them to generate the service, and not because i am a completely clueless dingbat. switch say they will make these kids to fit any size of bike, that basically you discuss with them what you need and they will build the wheel to order. and there is a special adaptor for a folding bike like this one. it is a bit fiddly, but to be honest i did find it perfectly manageable,