Ian Hamilton a lawyer and the protagonist, is very angry at what he sees as the political and economic subjugation of Scotland by England, and sad that Scots are somewhat ashamed to be Scottish (symbolised by the description of Scotland as "North Britain" in much material of the time) so he decides to perform a symbolic act to put heart into the marginalised Scottish nationalist movement. He creates a daring scheme with a friend to liberate the Stone of Scone (a.k.a. the Stone of Scone) back from Westminister Abbey in London, where it had resided for centuries following English military victories over the Scots in the Middle Ages. They both research the Abbey and create their scheme, but once his friend realized that Ian was actually serious about liberating the stone, he backed out. So Ian decided he would liberate the stone by himself, but before he left, he went to see the head of the university (a prominent campaigner for Scottish Nationalism, played by Robert Carlyle) to ask for funds for basic necessities. He provided, and later, at a party, referred Ian to Kay Matheson, a girl with strong Nationalist ideas, would help him retrieve the stone.
After a variety of rather comic mischances, the group retrieve the stone from Westminster Abbey and return it to Scotland. After repairing damage, they return it to the authorities (having achieved their political aims) and are arrested and charged, but not prosecuted, on charges relating to the case.
The final narration on screen points out that though the Stone is now in Scotland, it is only 'on loan' and will return to Westminster for the next Coronation of a British monarch. [D-Man2010]
Which church do they steal the stone from?
Westminster Abbey