Ive had good results with Dhillon gravy also, its probably the best part of the book to be honest, however I think Pete's 600ml oil is the best I have tried so far but I havent tried ck's yet from the chef which I will be trying next.
Cooked a chicken keema balti last night for 4 and it was absolutely stunning, I say cooked last night I actually cooked it a day before and left it in the pot, when I say I have had good results in the oven that is purely reheating something cooked on the hob.