My first attempt at this tonight, albeit a veg version, done for Mrs BB and the 2 kids, in conjunction with Chewy's Chicken madras.
Mrs BB well impressed, plenty of heat but she suggested putting the toms in later and adding a bit more cauliflower.. all told she gave it a 7/10 (in t/away terms) so all is good.
What was good is that there was a noticeable difference in the sauces of the 2 dishes. Now to you lot this sounds mundane but when I've been invited to 'curry nights' at mates' houses, it's basically all tasted the same, so it was a massive confidence boost to see the difference even though I used Chewy's gravy for both.
So, thanks to Razor for the recipe, pics and the like, well happy with the result.