In short: Perhaps later in season? Would be shame to call it off through bad weather. In full: Holding it later on, say in May, might avoid the possibility of having to call it off through bad weather (ice, snow).
Although it might then clash with other events, I feel that would be offset by the popularity of such a well organised event as the BHM was.
Where else in south Lancashire (and it's fairly central to the whole country) could you hold a trail marathon with such great views, and not be mithered with road traffic etc?