Active hybrid 3, 40000 mile service. Is thef ZF 8hp transmission service necessary?

[Who's who]

2012 AH3 due its 40,000 mile service. Bmw dealership quoted £950!! As the ZF 8hp transmission oil requires replacing (apparently fluid alone is £290).

i can't find real evidence to support or not support the transmission service requirements other than its driving based ( I do a lot of motorway miles). 

can anyone advise?

[E46King]

Haven't see a lot about AH3 servicing yet to be honest but oh my that is expensive for a service and enough to put a lot of people of buying one I should think!

They must be having a laugh at £290 for fluid... how many litres does it need? Can't be that many? No way should transmission oil cost more than engine oil. Does it contain special whale semen that lubricates the gearbox more effectively or something.... crazy!