Can someone tell me the end ?

Taken from the description on wikipedia:

Unfortunately, the food supply is spoiled when the cellar where it is being stored becomes flooded, and it appears that the Burgundians are beaten. Just in time, three Burgundian youngsters learn about this crisis and toss food across the border, setting an example for sympathetic Londoners; they begin throwing food parcels across the barrier in an improvised "airlift", echoing the one that ended the Berlin Blockade. Soon, others get into the act. A helicopter drops a hose to deliver milk. Even swine are parachuted in (possibly a reference to the expression "when pigs fly").
Meanwhile, the government comes under public pressure to resolve the problem. It becomes clear to the bumbling British diplomats assigned to find a solution, Gregg (Basil Radford) and Straker (Naunton Wayne), that defeating the Burgundians would be no easy task, so they negotiate. The sticking point turns out to be the disposition of the unearthed treasure. At last, the local banker (Raymond Huntley) hits upon a novel solution: "A Burgundian loan to Britain!"
With negotiations successfully concluded, an outdoor banquet is prepared to welcome Burgundy back into the fold. Just as Big Ben strikes the hour of reunification, the Burgundians realise they truly are back in England when a torrential downpour sends everyone scurrying for cover.