Another Potter softer here, there is the local Op-Tac sites available as well although I'm not sure of the quality of the games days at the moment.
I've been to the Squad Assault site, a great little CQB site ran by a bloke called Si who is very friendly
Anzio and Stormforce are also great sites! But my team (20-30 members) have had bad experiences with the marshals/home team there as of recent.