Ive just fitted a new pinion seal in the diff - the old one was pouring out oil and the old oil seal was found to be hard and brittle.
New seal £1.94 from DSN, seems very nice quality and fitted very well

I used a length of dexion to hold the prop shaft connection flange whilst I undid the nut and for re torquing to 140 lbft.
I cleaned out the diff internals and was pleased to find all in excellent condition with no wear visible on the gears and no sediment in the case.
Heres some pics:



Taupe