SK;
Working form memory here, but if I recall correctly from the CSCC EGM on the subject, there are 151 cave entrances that have been identified as lying on Access Land. Some of these are gated at present, but the CSCC Conservation & Access Officer stated that of these only four concerned him with respect to possible conservation issues. These were St Cuthbert's Swallet, Upper Flood Swallet, Bone Hole and Grebe Swallet. These will need Section 26 applications if access controls are to be maintained as and when CROW is officially re-interpreted as applying to caves.
There are several that are gated for public safety reasons, and there has been some debate about which of these would warrant Section 25 applications to maintain access controls for public safety reasons.
Hope this helps,
Ed