I flew out of Luton last week via Cheesy. They stopped a couple of guys I saw and made them put their bags in the hold, but they were pretty blatantly flouting the regulations. Huge bags ! I wandered on with about 4 bits and pieces, which would have fitted into my cabin bag if they pushed the point.
If you get a newish plane they seem to have made the lockers mahoosive, there were no problems on two packed flights.
Also, don’t bother with Speedy Boarding, on the return flight about 75& of people had bought it, which kind of defeats the purpose. Then they corralled us into another room and went back to random order and I was third on. Usually I just wait for the end and stroll on last. Small victories !