I personally haven't drove the car yet, my time later on today , but we did try HDC on the open roads on a medium to average gradient , with the clutch out and the car rolling in first gear (< WRONG from the word go), that just caused the engine to bounce off the rev limiter.....but later on today I'll be getting the chance to take it off road and I have a reasonable idea of how to go about it

Thanks Chris

P.S When we have some momentum I'll push in the clutch while HDC is engaged, to see if it deactivates it or something