Thanks for all the advice, I really appreciate people taking the time to respond.
A friend of mine gave me a lift to Bearmach in Caerphilly today, which is about 40 miles from my home. He checked the output shaft bearing and said it was ok, Bearmach agreed the bearing was fine but their replacement was £3.40 +vat, with OE one at £47.00, so I purchased the cheap one just in case I damaged it changing the shaft. Bearmach did a good deal on the shaft, their own again, at £65.00 +vat, plus oil and sealant, I spent £103.00. The old LSD or VCU has gone back on the car, I did check it the way Ashcroft say, I can just about turn a wheel with a single axle off the ground, but it's very stiff.
I have just finished putting the car back together, with a quick test drive, all seems well, fingers crossed. So this breakdown has cost me in total, with the recovery, about £170.00, and just a few days.