My parents bought me as a b'day present a 1 day bike maintenance course at Edinburgh Bike Coop. It was an excellent course and I can thoroughly recommend going on a 1 day course. Indeed, I was amazed at just how much I learnt. I was able to subsequently build a bike from the frame to a working bike (real satisfaction). I know you are down sar'f, but there must be similar training opportunities in England. Or even better, take a weekend break in Edinburgh - you will love it.