Well having just eaten my first attempt at this I have mixed feelings. The thing that jumps out at me is the flavour of coriander (seed), it clearly dominates the overall flavour and I wonder if this is the 'Glasgow' flavour. It's no surprise as both the base and pre-cooked chicken have this dominant flavour separately.
There was no oil separation and what with the amount in the base, plus that from the pre-cooked chicken (which is essential as many spice flavours come with it) and that contributed by the coconut cream, I'm not overly happy at the calories that must be hidden in the curry. Add to that that, for me at least, it didn't seem to improve the curry in any way and it makes me prefer to stay with the English way of doing things where I can at least scoop the excess off at the end.
Tastewise the curry was good but surprisingly hardly any different to the curries I already make the English (Bangladeshi) way.
Although the pre-cooked chicken spice mixture was very tasty, the chicken itself was lacklustre in flavour.
Overall I felt that a lot of work (compared to my normal method) went into something which is no gain on my current efforts and the overpresent coriander flavour, retained oil and lacklustre chicken flavour doesn't persuade me from the English way.
However, I'm only one Madras in and I've got enough for another couple of curries, so we'll see.
Oh and I should fess up and say I only made a 1kg of onions' batch as I don't subscribe to the theory that you can't do smaller batches pro-rata, although I accept that this may open up a debate as to whether I have made a real 'Glasgow' base or not.