I still can't see how it is cheaper to make your own stock. And I do believe that most types of home cooking is cheaper than ready made when comparing equivalent quality, I just can't see if for stock.
A kallo organic chicken stock cube, which isn't the cheapest on the market costs about 25-30 pence. One cube makes half a litre of stock. It doesn't contain MSG or artificial anything and it tastes nice. To make some stock, you need:
carrots,
celery,
onion,
bay leaves,
salt and peppercorns
Fuel to cook it
Even if you say that the chicken carcass is free and only have ten pence worth of each type of vegetable, you haven't accounted for the bay leaves, salt pepper or gas and OK you might have 2/3 portions, but it's never going to be cheaper is it?
And even if it is, you are talking about pennies a time, which doesn't make it worth the effort of making it, storing it, defrosting it, washing up after making it?
Those of you saying that it is cheaper to make it yourself, what are your costings?