Prince William to attend world premiere of Peter Jackson's new film

WWI in colour: Footage restored by director Peter Jackson

WWI in colour: Footage restored by director Peter Jackson

To do that, the acclaimed New Zealand director hired forensic lip-readers to go through old silent film footage of the war and uncover the conversations that took place in the trenches and on the battlegrounds 100 years ago.

Grainy video of soldiers in the bloody battle has been carefully remastered and turned into colour footage for the first time to mark the centenary of the conflict between 1914 and 1918.

Director Peter Jackson attends the world premiere of "The Beatles: Eight Days a Week - The Touring Years" in London, Britain September 15, 2016.

The 90-minute film is narrated using snippets of interviews with 120 veterans, recorded in 1964.

Image: Black and white footage has been turned into colour.

Mr Jackson, who has won three Oscars, spent four years working on the documentary was inspired by his life-long interest in the conflict in which his grandfather served in the British Army.

"I wanted to simply give people a feeling as accurately as I could... to what it was like to be in that war and just what it was like from a human point of view", Jackson said of the documentary. As the beginning of the London Film Festival draws near, Kensington Palace has announced that the duke will attend one of the world premieres to support veterans and director extraordinaire Peter Jackson on October 16.

'It's not the story of the war.

"Not one soldier on the Western Front, I guarantee you, not one soldier could sit down and really explain in political terms what was important about fighting the war, what was important about beating the Germans".

As well as being shown in cinemas, it will be given to all secondary schools.

The film was originally announced in January as part of a series of events announced by arts organisation 14-18 NOW.

They Shall Not Grow Old comes comes out in the United Kingdom on October 16 - the 100 year anniversary of WW1 ending - and was funded by the government, with Jackson directing the film for free.