Thanks for all the quick responses everyone..and thanks for the welcome
habilis
After looking at the cost of buying the tools, I have decided to let a shop have a look at it.
They have quoted £25 for a whole new back wheel, it sounds like it might be the best option as it was much cheaper than having to strip it all down to have a look at it.
Thanks a lot for your help; it has helped me learn a little bit more about them...