My experience of train travel in the UK is that as soon as the legal requirement to wear masks was dropped (both times) most people stopped wearing one.....even the staff. I see very few wearing one these days.
I visited Scotland (Edinburgh) in May and I can't say that any kind of mass mask use stuck in my mind. I did a couple of walking tours. On one of them nothing was said about masks, until the second half when the tour went inside and we were told we could wear one if we liked but didn't have to, and no one did. And the second tour a few days later (that also went inside) I don't think masks were mentioned at all, despite their website going on about them.
I mentioned it before in another thread, the hotel lift area and lifts had signs demanding mask use, but again no one wore one, even the hotel staff.