Hi JB,
Thanks and no probs. I'm fairly sure they use leg, I can't think of any other cut that would render in such a small space of time, without being very expensive. I love Neck and even Shoulder fillets but they take some cooking to be really succulent.
As for the Panch Phoran, I use it extensively, especially in my pre-cooks, some rice dishes and also sides like Sag Aloo, Bombay Aloo etc. The other of favourites is Black Cumin but I don't know if the IG use this at all, it's just something I stumbled upon and loved, works great with Lamb which is why i mentioned it.