Oh, there are so many great squads - just take a look in here.
But Devilman is right. If I were you - living in UK - seriously wanting to master Warthog I would choose 74th:
http://www.74thvirtual.co.uk/index.php
Maybe you should consider participating in the open workshops by 74th (second tomorrow at 20:00)? Take a look at community news: http://forums.eagle.ru/showthread.php?p=1620996#post1620996 :)