Thanks for the replies, I agree with the figures from Axe for 55.5 ml oil making a curry with 250 ml base from a 9 litre finished base.
I've got a figure of 8 Kcals per ml of any oil or fat so I get 444 Kcals for the oil in a curry. That sounds fine to me, I'll have to make this when I get a chance.
Cheers
Paul