Proceeded to cook the base until the oil rose to the top, another 20 mins or so and as already mentioned by some, what a lot of oil

I left the base to mature for a day before making the madras. Couldn't resist the temptation to taste it as i was curious to see if it tasted sickly sweet but this wasn't the case. It tasted just like many other bases - a thin soup with a subtle curry flavour. So far so good

Then prepared the ingredients for the madras following Ray's suggestion of scaling down the mix powder and tom puree. I had no pre cooked chicken so cooked the meat after the initial reduction with the final quantity of base and coriander.
The end result - BIR looking curry with correct texture. I tasted it and agree that it's a damn tasty curry. How close it is to a BIR madras, as always, depends on the individual's expectation and what they are used to from their own local BIR or TA.
Not being a madras eater (at least vindaloo, preferably TASTY phall), i cannot comment without having a BIR madras alongside mine to compare, although i will probably just find a guinea pig to try it out on.
I agree with one comment that the base has got "mess with me" written all over it and i will certainly be doing that. Plan for this afternoon using the base is UB's garlic chili chicken (tikka) and the madras again but this time with a ramp up of chili powder and some fresh thrown in with Dips mushroom pilau and maybe brinjal bahji.