Right then,made Taz's Base Yesterday and I used 450m of Oil from my dedicated Bhaji fryer, I dry roasted the Coriander and Cumin seeds and then ground them.
All went well with the cooking of the Base and the Oil that surfaced at the end of the simmer I stirred back into the Base.
Cooked our Curries tonight ( 2 x Madras ) and started by frying the G/G ,Tom Paste (watered down) then the Spices,first ladle of Base went in and I reduced this down as much as I dare having the Spices etc in the pan,second ladle of Base,pre fried Chicken then last ladle of Base,pinch of Garam Masala squirt of Lemon Dressing,cover pan for last 30 seconds ( as per chewytikka post ).
Job done

And the result ........... very very nice ;D
Easily as good if not better than our average local T/A but would have to do a side by side taster to see if it matched our favourite T/A.
As a guide the Mrs usually leaves some of her Sat Curry so She can have a taster Sunday tea time but tonight She ate the lot ! :
As Paulp said it was very Oily.