Jon, everyone who has responded to you on here has done so politely and accurately. If you are upset that people are turning around and saying they can't help or 'don't do this' then fair enough, but that is being said to you because there are reasons. The cave/mine world has been through some really bad times, with amazing caves/mines filed in forever or people killed and no one wants to see a return to that. There are systems in place these days to prevent a return to those times. The system may not be perfect, and it might need to you have a ?17 plastic card from time to time, but it keeps us able to visit some places. There are amazing digs and projects going on all over, but they have been started with permissions and then the diggers don't need to hide in bushes. I know one dig that even had assistance from the landowner with a helecopter supply drop.
There are people on here that will help you, people on here who can go out with you, but you'll only get the same response from any of them on an open forum, especially if they don't know you - "get permission". The people you talk to on here are some of the most hardcore cavers and diggers out there, some of them work for organisations like Breedon or National Trust, some of us are in cave rescue and some of the people in this thread alone will have seen and discovered more mine than you'll probably ever see. This place is a hub for people who live and breath caving, mining and digging, you should really listen to responses you get. If you don't like that you hear is everyone else wrong or do you think it could be you?
As I have said to you before, I am happy to continue to help you and so is DCA, but you need to understand that these things we need to do are done for a reason, sometimes they are the only things keeping a site open or cavers allowed to dig. One bad move by someone could jeopodise years of work and lose access for all cavers permanently.
EDIT - cross post with SamT but we make a similar point.