British Caving Association
A governing body for underground exploration in the UK. There is information about cave conservation, equipment, and legal issues for cavers.

Subterranea Britannica
A society concerned with underground places in the UK. There are details of Cold War bunkers and underground sites searchable by county.

William Pengelly Cave Studies Trust
A charity and limited company established to further the study of caves and to help to promote cave conservation. There are details of the Pengelly Centre in Devon and local caves.