Three of us from MCG, explored Lathkilldale Sough for the first time, way back in 1991 and we descended the shaft at the end of the level, which has a dog-leg and is 75 ft deep(approx). There was a spit about halfway down. We were using ladders/abseil I seem to remember (I descended first) and the ladder was a bit short(improvised)! I paced out the distance downstream from this shaft to where the water was up to the roof (there is an offset shaft to surface at this point) at 1070 feet approx. I produced a sketch survey and noted there was a (very) short side level and a short natural section downstream. Stand up walking passage (approx 3ft width) wading all the way. Airspace varied(minimum approx 15 inches). One thing I do remember was that the water in the sough was extremely cold, which was a bit of a surprise, considering you are not that far underground. Upstream(passage larger, width 5ft approx) you soon reach a roomy chamber & Batemans Shaft(60 ft deep approx). I noted there was some red modern graffiti in this chamber! A short distance beyond the chamber you reach a wall blocking the passage, which had water trickling over top. There are two other short passages in vicinity of chamber, both blocked. I took a few photos (slides) downstream.
I explored the sough a second time in the 1990's and I seem to remember we measured downstream with a fibron tape and distance was about the same, as I had paced out!
Hope you have a good trip.
Paul