In reply to Alan James - Rockfax:
Legal action!!! For what, incitement to trespass? I don't think that would be an offence, and any civil action would almost certainly have to show the quarry companies incurring some kind of financial loss.
Not been to Willersley for years (decades?), but the situation was always, climb quietly (no loud swearing, screaming) because the "god squad" who own the land are just across the river and we don't want to cause any offence (with possible escalation to access issues). But, that apart, it never used to be a problem to actually climb there.
Great summer evening crag.