hi Marmet - if you're west london way then there's a chilled out cycling club that does 2 rides on the weekend. No showboating or macho nonsense. PM me and i'll send you a link to the club site. If you're east london way try
www.rollapaluza.com another friendly, chilled club.
if you search 'trixie chicks' on the forum then there's a lovely crew of girls who do polo and social nights