Im off to spen as well. Was guna do hull as thats always been my stop before london but chose this instead. Watched a you tube video and it looks hilly. Maybe should have stuck to hull but hopefully a good hill session wont take to much out of me. I did holmfirth 15 about ten years ago and i enjoyed that and that was hilly as well.
in 2005 i had an x ray on what i thought was a stress fracture and nothing detected, rested for 3 weeks then started back slowly only to be back at the hospital 1 week later for a cast and out of action for nearly 3 months. if the stress fracture is minute it wont always be picked up or thats what i was told happened with mine. Hope this helps and it is awful when you cant run but sometimes you have got to look at the long term first.