They came to promote a film showing how millions of artworks were rescued and returned to their rightful owners after plunder by the Nazis. But George Clooney, Bill Murray and Matt Damon left implying that Britain, too, needed to have a long, hard, look at itself.

The Hollywood actors had become embroiled in one of the fiercest of all heritage controversies: should the Elgin marbles, removed from the Parthenon 200 years ago, be housed in London or in Athens?

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