Could an attempt on Swildon's Sump 12 be done like the attempts on Cuthbert's Sump 2 in the 80's. i.e in a dry period divert the stream at the entrance (or get the water co. to pump!), then put dams in the Swildon's stream way? I have never been to sump 12 (!), so would this be feasible?
Stu, what is the thinking that there is a parallel streamway? Is there less water further down the streamway, or some other pointers that there may be another route? Sounds like an interesting dig and good luck to you and the Wessex on the search for Swildon's 13, or would it be 7b
What happened to the Victoria Field Dig described in Mendip the Complete Caves? Did it not go anywhere or was it access issues?
Eighteen Acre Swallet looks like an interesting site to dig: above the end of St Cuthberts IIRC. From what I have heard though is a pretty dangerous place.