The Great McGonagall (film)

The Great McGonagall is a 1974 British comedy film directed by Joseph McGrath and starring Spike Milligan in the title role, Peter Sellers as Queen Victoria and Julia Foster as Mrs McGonagall. It is a humorous biopic of the Scottish poet William McGonagall that includes several of McGonagalls actual poems, his appearing in the title role of Macbeth and his improvement of the Bards plot, his pilgrimage to Balmoral Castle, the attempted assassination of Queen Victoria by Roderick McLean and a tribute to McGonagall from Lt Frederick Rollo of the Royal Scots in Zululand.

Source: Wikipedia