Just not worth it!
Without commenting on this specific case, taking stuff just aint worth it! I would always pay with a c/c then you've always got some proof that you have bought something even if you cant produce the receipt.
Crew sales at BA are so cheap - why would anyone want to steal it? Thats almost as pikey as pax taking off minatures becasue they're fee. Urgh!
But then if you've got a cupboard full of minatures, why would you keep buying more? Tesco's do a good deal on spirits and wine...apparently. And in proper sized bottles. Who can be bothered to keep opening little bottles of mins? Takes up far too much drinking time!