I commend pictures that try something different. Many films just seem like re-treads of old ideas, so that is the big reason I so strongly recommend Passport to Pimlico.
The movie is set just after WW2 and the post-war shortages and rationing seem to be driving Londoners "barmy". The film centers on a tiny neighborhood in London called Pimlico. They, too, are sick of not being able to buy what they want but can see no way out of it. That is until they accidentally stumble upon a hidden treasure and a charter which officially named this neighborhood as a sovereign nation many hundreds of years ago! With this document, they reason, they can bypass all the rationing and coupons and live life just as they want, since it turns out they really AREN'T British subjects! Where the movie goes from there and how the crisis is ultimately resolved is something you'll need to see for yourselves. Leave it up the brilliant minds of Ealing Studios to come up with this gem!