After BMW UK gave Murketts the green light, I've finally had my Diff oil upgraded to to newer, more expensive stuff F.O.C., but only because my diff is still very shiny

with less then 100 miles on it
Apparently anyone who's about to have their Inspection 2 Service done, needs to confirm with their servicing dealer that the newer oil is being used. Everyone else who's quite some time away from an Inspection 2 service and wants the Newer Diff oil, will need to pay for it