Right ok, I'll have a look tomorrow. I don't really cross my gears - i'm not fit enough to need any of them above the 3 lowest ones yet! My old bike was very low geared triple - I could fly on that in top gear. This one... not so much 
I've decided to get a tool kit and do it myself. Any good books I should look at?

I've decided to get a tool kit and do it myself. Any good books I should look at?