Hi Blondie
I have noticed a chicken stock flavour in some of the curries I have had but it doesn't have to come from the use of chicken stock.
When I first started into making restaurant style curries I used Kris Dhillon's book (didn't everyone?) and I followed the recipes to the letter. One of the curries, and only one, had this exact same chicken stock flavour, but if you read her book there is no actual chicken stock used in any of the curries. Unfortunately I can't remember which one it was, other than it wasn't one with cream or yoghurt in it, but it may well have been the dahl now that you mention it.
So the lesson is that that chicken stock flavour, which I really like BTW, doesn't necessarily imply the use of real chicken stock or cubes!
Damn. I wish you hadn't mentioned this, I'm now going to have to 'do the Dhillon' again!
Also that particular stock that you mention; do you have a brand name?