Hi DD, I got the idea because I remember, years ago when I saw a demo, back when what is now a large sit-down, was just a small take-away only, the gaffer told me they use ALL the chicken, he pointed to the base pot bubbling away on the stove. I took that to mean they took the meat off the carcass to precook, and made a stock from the bones to include in the base.
Their dishes nowadays, whilst still good, sometimes have the obvious flavour of a commercial chicken stock or 'boullion', if that's the right term. NOT nearly as good as home made stock. Presumably a labour-saver!
Basically I boil-up a left over roast chicken carcass for 2 or 3 hours, filter off the bones and discard them. let the remaining liquid cool and scoop off the congealed fat from the surface, then use all the liquid in place of water in my base, making up the quantity with water if there's not enough.
It's a bit of a faff, and filtering off all the nasty bones and stuff is not particularly pleasant, but it smells fantastic and adds a 'missing something'!!