doses of a covid vaccine. dozens of companies that sell covid pcr travel tests are to be removed from the government's list of approved providers. the firms either no longer exist or don't provide all the tests required by holiday—makers. 0ur transport correspondent caroline davies can explain more. these are the tests you have when you come back from a foreign country to the uk. you need to have either one or two tests. depending on which country you are travelling from and whether you are vaccinated or not. the government lists these providers on their website with the cheapest at the top down to the most expensive. it has come under criticism for not keeping a close enough eye as to what is going on. some say a particular price on the website, when you go to them they are more expensive or not available at all. some people have said they have paid for tests and not received results or have received them very late. even some test providers have complained there are cowboys operating in this market. the government has said now that 82 providers will be given what they call a two strike warning.