I get cut and highlights at Gina Conway in Wimbledon. I know it's not cheap but I only go about once every 3-4 months so it's a real treat. I'm not a fan of other chain hairdressers where the music is loud and played more for the young hairdressers than for the clientele!
At GC there is lovely relaxing background music, a free head and shoulder massage before they start on your hair and they don't engage in conversation if you want to quietly sit and read or just relax in silence. I've always found that the high/lowlights last well and look really natural and the cut shape suits my face shape and looks super for weeks and weeks too.