I've just completed the level 2 C&G diploma. It's a tough road but I literally just ask every plumber I bump into if I can shadow them. I also use twitter to follow other plumbers and ask them too. I ring up/email plumbers from Yellow Pages etc and just pimp myself out in a hope that someone will say "sure mate, hop on board!".
Also, doesn't hurt to ask around here. There is a 'Looking for Work' section of the forum, create a post on there maybe.
I've just met a fella on my sparky course who has a cousin who does bathroom/kitchen design and luckily he might be taking me on to do the plumbing for some jobs. It's just a case of asking everyone and anyone and being tenacious.
I read my books still, and buy and read more books all the time to keep the knowledge in my head. I also read a lot on here, there is a well of info and bits to learn and everyone is really helpful and encouraging.
I also try and do jobs for friends and friends of friends etc. And I'll give you the same advice I was given, get public liability insurance BEFORE you do any work. Mates can turn into enemies if you mess up their carpet!
Good luck man.. Just keep at it!