Oh these bloody acronyms! So CT is ChewyTikka, ok.
It's this one:
Chewytikka's Red Masala Mix
4 tbsp Yoghurt
1 tsp three Pataks Pastes
Tandoori, Tikka and Kashmiri
1 tsp Mixed Powder
1 tsp G&G paste
1 tbsp Mustard Oil
1 tbsp Vegetable Oil
1 tsp Red food colour (Natural Cochineal)
Now this is just the main ingredients for a tandoori marinade so in answer to my own question I'd just use a good, non-Pataks spice blend, as suggested earlier.