Reet then, time fer an update. Undid O/S lock nut with a long 3/8" extension bar, a bit of filing an a big piece of 42.4 tube I had lying around. Lock nut was done up too tight, inner nut was as slack as a whore's flaps. Next I found that the ABS ring hadn't been fitted properly and had been rubbing an goosed me ABS sensor

Cleaned it up, fitted new disks, new bearings and put ABS ring back correctly. Tightened everything up, fitted new pads which were the right size this time - old disks were knackered because wrong pads had bin fitted
Did the other side quite easily - ABS ring fitted correctly, but still wrong size pads had gubbed the disk and the bearings were not fitted right. Went for a test drive, marvellous, went over a few rough bits, bit of a noise. Stopped in pub car park for a celebratory drink, full lock manouvering out, clink clank, clunk, thud - back wheels locked. Oops, think me diff is gubbed

Gonna remove an take a peek tomorrow, sounds like the planetary diff gears are mangled as it's fine in a straight line, just can't turn corners. So, had to turn up to me noo job today in the Deepender - caused a bit of discussion
