Thanks!
I had to get my husbands old anatomy textbooks out, but now I know what all of the bits round the knee are called. That's exactly the place where it's bothering me. As I said it's not painful, but a bit uncomfortable, so I'll make sure to be more rigorous with stretching (hmm, I did pilates all last year and didn't have this problem, maybe time to start again).
I'm also looking for a sports doctor who knows about cycling and won't run for a scalpel when I tell him my knee is bothering me.

Thank you,
Bron