Despite there being a long established access procedure for these mines, they continue to suffer break ins, removal of atrtifacts, and all sorts of inappropriate equipment being left in. Recently the lock was cut off within a week of a new one being put on, which it is rumoured coincides with a posting going up on a website called 28 Days Later about a trip in there. There have also been articles appearing on the web really promoting Because of the great importance of part of the mine as a bat site access must be restricted, but as far as I am aware no request for access to responsible groups have been refused provided they are at a suitable time of the year. The police are also keeping an eye on the site from time to time.
It is now likely that cameras will be installed somewhere on the site, for monitoring purposes, which will mean at least anyone breaking in in future will be recorded doing so!