This looks like a really interesting alternative to a mass road race. Two things which I'd be grateful for others' views on:
1. I have just done the Paris marathon (my first) coming in a shade over four hours. The field here being so small in comparison, are we talking about a more advanced bunch than my level?
2. I like the idea of off road running, having had IT band problems in the run up to the Paris marathon. But I imagine off-road running would unwind the springs my legs more than the roads, and I wondered if I should train specifically for this aspect, or at least accept that it will be a more demanding course?