www.londoncityrunners.com is free and we have runners that do half marathons in 1hr 11. We're not in championships but we meet around 4 times a week in central London if that helps. Tim
Hi Caroline, If you're interested in runs in the City then www.londoncityrunners.com is free and we meet every Tuesday, Thursday and Sunday. We do a set 6k route along the river (over Tower Bridge and back over Millenium. Let me know if you want more details. Tim