OOh - we have the same idea! I have bought a chicken with this in mind - plan to roast it, slice it and use it for sandwiches rather than those crappy packs which make 1 lunch and cost half the price of a whole chicken!
DH and I have disagreed over whether it would be okay to freeze the cooked meat though - he says no because it won't be cooked after defrosting, but reckons it will keep in the fridge for up to a week. I don't see any reason we can't freeze it.
I personally would freeze any you don't think will be used within the week in that case. I go through loads of meats for my oh too & tend to cook a chicken, strip it, keep out enough for the week & freeze the rest in meal sized portions to use for something else.
Thanks ladies, freezing is a good idea, hadn't thought of that. Might check with the butcher again as to how long to keep it but I also thought about a week would be fine. I guess I'll freeze it and then take out smaller portions as and when needed and defrost it overnight.