I found the recipe
here. Probably better not to publish the full URL, given recent events...
For the sauce, I replaced the peeled garlic with Indus minced garlic and the peeled ginger with Nishaan minced ginger. The recipe amounts were good for 4 tbsp, so I used one quantity and froze the rest for later use.
In the main dish, I used plain, pan-fried chicken breast for the pre-cooked chicken and I replaced the 5 finger chillies with 2 heaped teaspoonfuls of my chilli jam. The spice mix was Abdul Mohed's 8-Spice and the base gravy was the liquid left over from pre-cooking some Kushi chicken.
The result was a really nice and hot lip-smacking, garlicky curry with a complex range of deep flavours. I cooked up some plain boiled rice to provide a bland accompaniment and mopped up the sauce with a couple of home-cooked chapattis.
I think the base gravy I used gave the dish a real boost, so it'll be interesting to see how it fares with just a plain base the next time.