I am a massive geek so found this an intersting little fact. Maybe work these conversions out in your head on a long run if you need to take your mind of the pain for a bit. Although there are prob better things to think about.
Thanks everyone I really appreciate your recommendations, well I may not be thanking you for the hilly ones at the time though but should give them a go as its not gonna kill me, prob hurt a lot though. I have a load to chose from now so will prob pick a few varied ones. Got me thinking I may try my first off road, seems obvious really.
I am looking for a 10k which is prefereably 1 lap and picturesqueness. I am looking in London and around the M25. Anyone recommend any picturesque london or around london (anything easy to get to by train) that they really love?