It used to be used for the running event 'The Killer Mile' every year. No idea if that's still going. We started at the level crossing at the bottom, went up past the pub on the steepest bit and finished after turning left at the top and carrying on for about 50 yards. Your entry fee allowed you to run more than one race so some folks did as many as they could squeeze in. Nutcases
I did it back in 2013 and don't think the route's changed much since then. It was mostly nice country roads, although with one dangerous descent over a level crossing on the long route. Mow Cop is OK as long as you take it steady.
The short route's gentle and should be OK for most.