Are there 'club' sports in London?

I've always enjoyed playing sports in adulthood.  I played rugby for a bit (though I tore my ACL so I'm not too keen on it right now)...have played flag football, softball, field hockey & soccer.  Are there clubs or leagues for not too competitive adults to play a sport or two in the London area?

I am sure that there are, I know that my local leisure centre co-ordinates some, and I'd bet that you can find some online if you look. Certainly if you check www.baseballsoftballuk.com you'll find some adult leagues in the London and other areas.