Glasgow metropolitan College is a good place for evening and saturday morning short courses. But some of the links posted here are also very usfull, also there aer tons of tutorials on youtube.
I'm in two camera clubs (for my sins), there is nothing wrong with just going along on the night when there is a talk or event that interests you, either as a visitor or to join. There might not be many urban explorers in the clubs but there are certinly lots of experienced photographers that will be only too happy to give advice on specific situations you might want to photograph.
Camera clubs can have a reputation for being a bit techie, but i find this isn't the case anymore. but as well as those guys there are also the guys who are intersted in great photography, you just need to get to know the guys on the same wavelengh.
Cheers
Echo Seven