‘Who do you think you are?’

The national newspaper reviewer waxed lyrical about the film at the Folkestone festival: “We follow tankers and canoes, ferries and fishing boats – and there’s the archbishop of Canterbury, helping out at an archeological dig along the coast, his hair a white, fluffy windsock in the distance.”

The only problem is it wasn’t Dr Rowan Williams whose hair was blowing in the wind, but second-hand bookseller Nick Spurrier, working at Folkestone’s community archaeology project, A Town Unearthed.

The mistake by the commentator in the National Coastwatch Institution film was the second time Mr Spurrier had been mistaken for His Grace.

He told The Times: “In the days when local residents had free passes to Canterbury cathedral, I visited in a purple Pierre Cardin shirt