In reply to nutme:
Going to open a can of worms here because it's controversial; however I feel I can give the definitive answer as I work on the Honister VF quite regularly.
As far as I know there are currently two true VF,s in the UK, Honister and Kinlochleven. Both are privately owned, having been constructed as a business venture at the owners expense. (Most, but not all, European VF's are funded by the local community to bring tourists into the area. The Saas Grund VF accident being the exception that springs to mind)
Yes, technically it is open access land, however it is also within the "mine sett" owned by Honister. Just as you would expect Hanson Aggregates to pull a face if you went for a wander through Horton Quarry. (Also open access land). As Honister VF is "owned" and subject to planning law; planning permission was required for its continued existence. It means Honister are liable for the safety of anyone using it. Just as Go-Ape would be liable at Whinlatter, also open access land.
The fact it is a private venture, tied with insurance concerns is the reason it's a guided trip.
In reply to Mypyrex: It's about mid grade as European VF's go. Sections of overhanging ladders, blank wall traverses, 60metre Burma Bridge etc. all with some good positions and exposure. Takes about 1.5 - 2 hrs to complete.
Cheers Adam