Cheers guys.
My GP knows about the knee problem (or at least, I've mentioned it in the past), but I'm not sure he knows how it affects my running. He's never looked at it himself: it was ineffectively prodded by a physio shortly after I damaged it, but I've just been soldiering on ever since. I think seeing a specialist might be a good idea...a sports physio would be great, but I'm skint...
Thanks a lot for the suggestions.
Peace,
Bunbury.