Strikes me that sump 10 could be related to an East-West Lead rake. A few months ago Big Jim told me that a good site to dig would be convenience cave, I'm starting to think that he could be right... http://www.tsgcaving.co.uk/gallery/category/6-p8-sump-project
I have added a few Snips to the website above, as I don't know of any other website to add it to.
Pure conjecture, but looking at the surface related survey, it would seem that the fluctuations in sump 10 could be caused by variations in flow from swallets P1 to P6, (Dr Jacksons, Gautries, etc., P7 has already been traced to the second streamway in P8 I believe), also maybe the legendary swallet in Coalpithole Rake.
From various descriptions, it would suggest that most active development beyond this point is likely to be phreatic with the likelihood of abandoned higher level stuff as evidenced in the western faces of Eldon Quarry.
Ash and Josh dived 10 and reported blocks of rock landing on them in the sump as they were diving through, I think the sump is quite restricted in the vertical plane. So they were touching roof and floor. Decided it was a bad do.
This is what I remember of them telling me, probably 80% accurate