My partner was at masson lees today and reported that there was a very irate farmer trying to squeeze his tractor in between inconsiderately parked cars (she mentioned that people were parked up in all the passing places down the road). It sounds as if the farmer was polite, but understandably annoyed at the situation.
It's a great little crag and it'd be a shame to aggravate access when considerate parking is fairly straightforward and should be the standard at any crag.
Such a great crag and would be a shame if it gets banned because people can't be sensible.
Be prepared to make alternative arrangements. There are loads of great crags around Matlock area and people need to accept that sometimes they can't climb somewhere because its too busy and go somewhere else!