Didn't think that base used cinnamon, cloves or bay leaf? I make the Glasgow base all the time, never seen that in the recipe?
Your are right, Mr Singh's version only uses cumin seeds with the onions, I find that by adding cinnamon, bay, and crushed cardamom pods (not cloves) , it accentuates the aromatic flavour. Also think Mr Singh adds oil at the second stage, whereas I add oil at the first stage with the oinions, whole spices and water. I have found it works better this way in the my pressure cooker version. I pretty much use the same ground spice mix as Mr Singh so far as I can remember from his video. So yes mine is a tweaked version and obviously different cooking method.
P.S. - Just noticed there is a rogue clove in with the cumin seeds, have to speak to my suppliers!
Cheers
Chrisnw