Phew - we got there. That passage was discovered by sadly missed divers Biffo and Scoff from the Bradford, whilst exploring the large underwater system between Jingle Pot and Hurtle Pot. They went on to identify a surface connection which was later opened by BPC members, with the help of certain other noteworthy northern cavers. You can access it now without diving, so I didn't think it was overly unfair to use that photograph. Mind you, it is well off the beaten track.
All yours again RobinGriffiths.