The Avengers (1998)

Mrs. Emma Peel and John Steed are spies who work for the secret branch of the British government called The Ministry. They are called in to investigate Prospero, a plot to blackmail Britain by controlling the weather. Emma Peel is suspected of being involved but it is discovered that she has a double who works for the real baddie, Sir August de Wynter. He threatens to freeze Britain, at one point unleashing a blizzard on Trafalgar Square.