Fans spend €1,860 a year on Katy Perry

Devotees of singer Katy Perry spend over £1,600 (€1,867) a year on their idol, more than any other fan group, new research has found.

British fans of the pop star, known as KatyCats, hand over an average of £1,627 to buy her merchandise and music, and attend her shows.

Fans of rapper Kanye West spend an average of £1,563 and devotees of boyband One Direction spend £1,239.