The photo archive is expected to sell between $2,600 and $4,000 when it goes up for auction at Hansons Auctioneers on Sept.

Over 140 behind-the-scenes photographs from five Harry Potter films, taken by a retired railway worker, are set to be auctioned in Derbyshire.

The photos - taken by the man who shovelled coal on the Hogwarts Express - are expected to fetch up to £3,000.