Well I hope it is easier to cook than the one I've just been trying to work out. After viewing the link to Ali's base gravy posted elsewhere I also looked at his Chicken Tikka Masala video and thought that looks pretty easy, and it probably is.
But wow. Talk about a confused and muddled task. Try to follow the recipe path for Chicken Tikka Masala. Should be easy enough you'd think.
Mixed powder (for the base gravy) - check.
Base Gravy - check.
Chicken Tikka Masala Indian Restaurant style. The description says it uses "
masala sauce, tikka masala sauce and red masala sauce", but the actual video shows only one sauce being used, which he calls a "Special Exotic Sauce". Supposedly the next video will show how to make this, but which video is it? In answer to a specific question about the exotic sauce, he directs one viewer to "how to make a diluted tomato paste with red food colour added", which it clearly isn't, and then even more confusing tells someone else that he put cream in it to make a mild dish.

Another viewer asks if it is the same as the Tikka Marinade and is answered by somebody else who confirms that it is. So what is the Tikka Marinade then?
Precooked chicken tikka perhaps. Nope, but there is a 48 second Chicken Tikka Marinade video showing a chef's hand mixing an unknown marinade through some cut up chicken breast. No ingredient list or referral to another video here though.
Undeterred I browsed every video and found his Tikka Masala sauce, which looks promising and like it might be the right one used in the video as the Exotic Sauce. Let's hope so. But is it the same thing that the chicken was marinated in before it was pre-cooked? You'd only be guessing if you tried to cook this from these videos.
So the remaining question here; Is the Tikka Masala Sauce used as both the marinade for the pre-cooked chicken and the Specal Exotic Sauce in the finished dish?