Latest MOD Sanctuary magazine has an article on Ogof Gofan, whilst the previous edition (2015) has this site in Dumfries & Galloway on page 41:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/469631/15-07-275_Sanctuary_Magazine__FINAL_lowres_.pdf
Mike
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/469631/15-07-275_Sanctuary_Magazine__FINAL_lowres_.pdf
Mike