Roar has already clocked up Katy Perry's highest weekly UK sales with two days of trading still to go.

The Virgin single, whose UK release was brought forward a week, had sold 131,745 copies up to the end of trading on Thursday, according to the Official Charts Company. That already beats Perry's previous best UK sales tally of 123,607 achieved by California Gurls featuring Snoop Dogg in June 2010 with the total set to go much higher as Friday and ...