Service in British restaurants

This afternoon we stopped at Denny's. This would be unremarkable in the US but they are a relatively recent phenomenon here in Britain so they seemed worth trying. The menu is much as I recall (except for the appearance of sriracha) but the service was more as we have learned to expect here: they got my order wrong, brought by somebody whose demeanor suggested they would rather not be there at all, and drink refills needed some chasing down. At least they improved over a café earlier in the day which managed to bring appetizers after the main courses. The food was variable; I shan't feel the need to rush back.