[Callum]

THE top-secret film script of the final Harry Potter book was abandoned in a pub - after the movie's crew went on a bender.

The 118 pages reveal dramatic changes from novel The Deathly Hallows.

It was given to The Sun by a reader who found it at a boozer in Kings Langley, Herts, often used by star Daniel Radcliffe, 20.

The script - marked "Private and Confidential" - was spotted under a table.

It reveals how film chiefs have made several dramatic changes from JK Rowling's book Harry Potter And The Deathly Hallows.

Studio Warner Bros last night thanked The Sun after we handed back the lost script.

And bosses launched an urgent investigation into how the inch-thick booklet was lost - as sources told how the film's crew went on a major drinking session.

The £250 million film, starring Daniel Radcliffe as the schoolboy wizard, is currently being completed at Leavesden Studios in Kings Langley, Herts.

On Thursday night a large group of film crew went to the nearby Waterside Tavern.

A source at the pub said: "They'd got behind schedule in filming but then caught up, so they went out for a celebratory drink which led to many more.

"There was a huge group. They were here all night, laughing and joking, chucking back beers.

"They usually come down for a session on a Friday, but because it was Easter they were in a day early.

"Daniel Radcliffe is the only member of the cast who has been known to come down and have a laugh with them, but he wasn't there that night."

The Sun reader who found the script said: "I couldn't believe my eyes. I know guys that work on the film drink in the pub, but it's very embarrassing that someone could just leave it there.

"I'm glad I've helped to stop any surprises being leaked."

The script shows how film bosses have split the final Potter story into two parts to keep fans in suspense. The first film - with Daniel's co-stars Emma Watson and Rupert Grint back in their usual roles - is due for release in November. Part two will follow in July next year.

The Sun has seen how producers are making a number of dramatic changes from the book, but we are keeping the details secret and have blurred our picture of the script so as not to spoil fans' enjoyment.

A Warner Bros spokesman said: "We are grateful to The Sun for the safe return of this script." It is the THIRD time that Harry Potter secrets have almost been revealed prematurely.

In May 2003, copies of The Order Of The Phoenix book were found in a Suffolk field six weeks before the publication date. Then four years ago the script for that film was found at an alleged "dogging" site beside the A25 in Chipstead, Kent.

Source: The Sun