UK Regional Cave and Mines Access guides summary
Mendip
Council of Sothern Caving Clubs (CSCC): https://access-guide.cscc.org.uk
South Wales
Llangattock area, https://chelseaspelaeo.org/cave%20info.htm
Penwyllt area, https://www.swcc.org.uk/joomla-swcc/caving/local-caves-access
Devon and Cornwall
Devon and Cornwall Underground Council (DCUC), https://dcuc.org.uk/cave-access/
Derbyshire
Peak District, https://peakdistrictcaving.info/home/the-caves
Northern
Council of Northern Caving Clubs (CNCC): https://cncc.org.uk/caving/
Do note this is not a definitive list, further regions and additional links to be added.