Because there were plenty in the queue that had come off the night shift at the hospital she recognised and some in the queue had kids with them (bit of a giveaway). I think her bigger gripe was the fact that there was no checks at all and so the NHS didn't really get any benefit for getting there early.
I fully agree that they should check everyone and her guesstimate may well be right. But her logic that she’s simply presuming that all that she didn’t recognise from a previous night shift is massively flawed.
as to the kids, if it was whole families then. I’d probably agree that there pulling a fast one, but if it was simply one parent. It could be that the other parent is a key worker.
Considering the support for the nhs last night, I think more people may be respecting it than people believe.