The relaxed atmosphere of a sea-side resort makes language study less like study and more like a holiday. In Brighton but only a few can be recommended. Take care and choose the one that's right for you. Ask for special advice. For maturer students wanting a language programme to suit their professional needs Hastings and Folkestone may be good language destinations.
Prices are much cheaper than London but the standard of teaching is high and so very cost-effective.
Then there is Torquay, Bournemouth or Portsmouth.