This is the institution I meant to post:https://en.wikipedia.org/wiki/Royal_Central_School_of_Speech_and_Drama@Foxy
’s advice looked good to me. CSSD is a little less cliquey than RADA.
I’d add that there are numerous good places to study, and it would probably be sensible to put a lot of effort into investigating the details of particular courses, as finding one which suits what you want is probably as important as choosing a particular institution.
Means trawling around a load of university/college websites, but worth it.