The Ritz serves at 3:30 and 5:30.
I has always thought of it as "High Tea" at 4:00 myself, with Northerners having "tea" later, from say 5:0. Northern tea being a more substantial meal, comparable to "Dinner" in the south.
Obviously, They had dinner at lunch time.
Certainly in the 70's it always seemed to me when on holiday, that Northern families tended to be in the dining room earlier than southerners, but I suspect in 2010, this is probably a quirk of the past.
However, before anyone mocks me for my southern ways, as a student, I could never get a handle on the times for northern chippies. They'd round my way open at say 4:00 ish, open for a hour or so, and then close for a couple, to reopen at say 8:00 ish.
Southern chippies tended to open later, say 6:00 but then serve through to later, say 10 or 11: ish.