Hi Nick,
I am a long way from Nenthead at the minute, but I am intrigued by your inference that the entrance to Smallcleugh was becoming a little suspect!
In my opinion the horse level from the entrance to the Dickenson or Hard Level cross cut has remained pretty stable over the 50 years I have known it.
So where is problem?
I can understand that Proud's sump, does provide an alternative way out and as such the hangers, and bolts should be looked after, but surely even this is only a second way out if you have the necessary abseiling gear?