Tell you what.
You cannot beat a Co-op meal deal as a hangover cure, you get co-op sandwich (any of them with chicken in are excellent and cannot be beaten by any other sandwich based meal deal, other than boots) and a co op chocolate brownie which is also excellent.
My weekly saturday hangover cure is get one of these from the shop in Ladybarn (we live near a place called Ladybarn, lol) and then go and spend 50p on a stupid accumulator from William Hill across the road and have a laugh at the stupid return.
Another great snack has got to be the festive bake from Greggs - 2 for a measly 2 quid. Go and get two. Now.