Thanks for the comments guys.
I have tried a few of the recipes on here for butter chicken but some were pretty complicated and were not giving the flavour I was after.
This one is pretty much straighforward and the flavour is almost exactly how I wanted it to be.
What I didn't mention is that I passed the sauce through a seive afterwards and transferred the cardammons and cinamon to the seived sauce and added a little more methi leaf. Gave a really smooth sauce.
It also contains chicken tikka using blades recipe with a little added yoghurt to the marinade with extra mint sauce.