Sorry but I think that this thread is going off at a tangent.
Free and easy access to mines on the CAL schedule, yes, because there are no conservation issues related to visitors, its all related to natural decay and conservation means interventionism in the form of remedial work.
Parc exploration would not get you very far without the efforts of my helper and I, 5 digs in there that will last indefinitely, 3 ladder refurbs - down to me.
Henfwlch - far reaches via my dig, actually the first use by me of steel and concrete
Talybont - a team of WMS bods including me, concrete refurb, me alone and took 12 months. No Roy = No access to deep adit. No democracy, well I am really sorry about that. Maybe I should have took opinion about the brand of cement.
Sorry about the rant, its late, just got in from training, food in the microwave.