Honestly the amount of men I see trying to just flick the scanner and pass through is frightening. Let alone the people who have their Covid passes on their phones and hold up the rest of the queue messing about trying to find it.

Just go with a paper boarding pass..... I saw a young chap last time I was at LHR thinking he could fill in the Entry Form for the country at the check in desk until they asked him to fill it in and then come back!