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This was a great movie, very funny. They steal the pig that is going to be used for a big feast and they are trying to keep it alive in their house and blackmail their way into the upper crust of the town. The old lady in the house is convinced they are trying to put her in a nursing home by making people think she is crazy, so she goes around saying "No pig, there's no pig!" It's a very gentle and dry humor mostly, but with some quirky little hints at weirdness here and there. Man, I forgot this one, need to get it on dvd!

Can't remember the name, but yer man who played Uncle Vernon in the Harry Potter movies was also in it. It was set during the years of rationing if I'm not mistaken

The name of the movie is called "A Private Function".
I hope this helps.