It's as esoteric as it is hard, the massively famous - but only if you know somebody that knows somebody - Trunce.
A proper no nonsense, no frills, no-divas-thank-you off road race series that is only learned about through whispers in dark corners of club rooms.
There are no marshals, no route markers, no changing areas; there are though, plenty of grizzled old sweats who've been running the fells since they were teenagers. It's the kind of event you only do once, or can't stop doing.
Mick and Rose gave it a go last Monday night. It remains to be seen if they will return...