Pool Bank Cave it is. Over to you Pitlamp.

To narrow it down - this one is in South Cumbia at the base of a lot of limestone. It has an OS map name and a separate Northern Caves name. The all-weather resurgence below the cave is a water supply. I'll give it away in the next couple of days if no answer.

I thought I'd seen something similar before. That floor is very distinctive. This one features in a corner of the Northern Caves area where there's loads a limestone but not many holes in it:

Midge Hole?

I worked on the Remote Control Mine Disposal System (RCMDS) simulation software back in the '80s. One of those might be useful if a mine is ever found in s sump.

Dub Cote Cave?

Magnetometer Pot River Styx area?

Gypsum Passage to Easter Grotto?

Correct. Over to you Andy.

Lockey Gill?

Don't camp here. - you'll end up at Leck Beck Head! (11, 8)

Pasture Gill Pot?

The clue is one for the oldies on here. Before Ingleborough Cave gained its electric lighting, visitors were given three candles on a stick and the guide had a hurricane lamp. The thanks for Pitlamp's restraint in not giving the location away, is a further clue as he has the best job in the...

That's the exact spot Tobyk. Known as the Pool of Reflections if I remember correctly.

Thanks for exhibiting admirable restraint Pitlamp.