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Thanks everone for their various bits of advice.
As the car is still very much in bits I will let you know on progress but from the advice so far it seems
BJ8 rotors will fit earlier hubs
The jag calipers take 1/2" rotors
Probably does not need a booster
Split system just for safety reasons
I am hoping to get a pair of BJ8 rotors of a mate who put new ones on so will use these to try out the fitment
Will keep you posted!
Cheers
Bryn
Suggest (not verified): Jag calipers will require adapter plates with 3-1/2" bolt centers