Warner Bros has announced the first raft of operators that have been approved to sell tickets for its new Harry Potter studio attraction at Leavesden Studios, which opens next spring.

Timed, pre-booked tickets for the new Warner Bros Studio Tour London - The Making of Harry Potter experience are due to go on public sale on 13 October.

US-based exhibition design company Thinkwell has been working on the scheme, which is set to cover more than 150,000sq ft (13,935sq m) of the Leavesden complex.

The three-hour tour will give visitors a behind-the-scenes look at how the Harry Potter films were made and will include sets, costumes, props and special effects.

Golden Tours, Superbreak, Omega Holidays, Newmarket Holidays and Leisure Breaks are the first set of operators to be licensed to sell tickets for the new studio tours.

Actor Daniel Radcliffe, who played Harry Potter, said: "People will be amazed to see the incredible environment we've worked in all these years."