Trumpy, I have been caught out a couple of times with trs, I have had to do a few repairs on it to get people going for the short term. I found the only way to work with it for a temp repair, is to heat it with the gas torch first, this makes it supple enough so that it can be stripped and sleeved with heatshrink. But I agree it is a nightmare. I had to do a partial rewire once and leave the old trs in the roof, the home had been in a fire many years ago (while trs was still being used). but the ceiling joists did not look safe enough to climb through anymore, so I meggered the mains (100 Meg) and left it, I still don't feel right about it though.