A 15m ladder pitch drops into a small chamber with a constricted 5m slit at the bottom. Where is it??

References: anon., 1975b (Easter and summer logbooks); Kendal Caving Club and Manchester University Speleological Society, 1975; Corrin J S and Smith P, 1981
Entrance picture :
Underground picture(s):
Detailed Survey :
Line Survey :
On area survey :
Survex file :