Thanks for all the contributions on this. Gordon’s & Dave’s memories correlate with Millers who along with Morgan, recommend 75w140.
To my mind, it seemed a bit heavy for a light vehicle. However, Rich is quite happy with the lighter version but as he said...you can overthink these things. Also amazing the price difference between Comma and Morris! (£8 odd vs. £20 odd)
I believe it is more important to ensure that proper LSD oil (or additives) are used in a LSD diff. to cope with shock loadings, more so than the actual viscosity.
