You’ve got lots of choice for people to ride with in Glasgow. I used to ride with GMBC are they taught me all I know 😉 A big part of GMBC is (or used to be) Sanny who organises fantastic rides each weekend. There’s also Wed night / tue night and local stuff at the weekends. There’s Rock Hard who are (or were) a bit quick. Freeflow bikes down in the south side also do a ride, or used to. I’ve never been along.
And there is a new club I’ve heard rumor of starting in Paisley. It’s going to be run by some people who know a lot of the trails down that way so should be good. I think it’ll be something to do with Thomson Cycles down in Paisley? Not sure if it’s all up and going yet.
Lots of choice. There’s also a very friendly bunch that post on http://www.uk-mtb.com/index.php who meet up regularly round Glasgow for a spot of more downwards pointing riding.