From left, Sir Elton John (centre) with husband David Furnish (left) and Billy Elliot director Stephen Daldry at the musical’s 10th anniversary performance at the Victoria Palace Theatre, London, on Tuesday. Photo: Dominic Lipinski/PA Wire

Sir Elton John has revealed plans for a film version of Billy Elliot The Musical – despite the stage version being based on a film.

The singer-songwriter also revealed his sons Zachary, 4, and Elijah, 2, have never sat through a whole theatre performance.

Speaking at the 10th anniversary performance of Billy Elliot The Musical, for which he composed the music, Sir Elton said: “It would be lovely to do a film version.”

The 68-year-old joked he would play the eccentric grandmother of protagonist Billy – an 11-year-old boy who follows his dream to become a dancer, against the expectations of a working class community during the 1980s miners’ strike in County Durham.

He said: “We have extra songs we didn’t include in the film that might have titles such as Goodbye Grandma and Not Only Poofs Do Ballet. You can only do so much on stage so it would be nice to change some things.”

Sir Elton, who was accompanied by husband David Furnish, who is one of the show’s producers, revealed he would love it if one of his young sons grew up to play Billy in the stage show.

“Hopefully it will still be on when they are old enough,” he said.

“They [Zachary and Elijah] have never been to the theatre except for The Snowman at Christmas – and we only lasted for half of it. But when they are older they will love it. I haven’t even taken them to The Lion King yet.”

Sir Elton composed the music for The Lion King.

The star-studded event, held at the Victoria Palace Theatre,coincided with the announcement that the show’s run has been extended to December 2016 and it will start its first UK and Ireland tour in February next year. After the anniversary performance, Billy Elliot director Stephen Daldry and writer Lee Hall confirmed they are planning a film version of the musical.

Fact file on the award-winning musical

• The first performance of Billy Elliot The Musical took place on March 31, 2005, at the Victoria Palace Theatre, London. The official opening night took place on May 12, 2005, exactly 10 years before the anniversary performance.

• Productions of Billy Elliot The Musical have been staged on Broadway, as well as in Sydney, Melbourne, Chicago, Toronto and Seoul, South Korea.

• The first foreign language production was staged in Seoul, South Korea at the LG Arts Centre in 2010 and 2011, winning three Korea Musical Awards.

• More than 10 million people have seen the musical worldwide and it recently welcomed its five millionth visitor in the West End.

• Simon Cowell, Louis Walsh, Sharon Osbourne and score writer Elton John have all made cameo appearances in the show.

• The Queen, Hillary Clinton, Nicole Kidman, Bill Gates, Ben Stiller, Michael Jackson, Oprah Winfrey, Victoria Beckham, Anna Wintour, Mikhail Baryshnikov, Hugh Jackman, Valentino, Helena Bonham Carter, Joe Biden, Kevin Spacey, Brad Pitt and Angelina Jolie are just a few of the famous faces who have seen the show over the years.

• Young performers from Billy Elliot have performed at The White House and at Buckingham Palace and have visited Downing Street.

• Since its world premiere, 40 boys have played Billy in London, 10 have played Billy in Australia and 29 boys have played Billy in North America. A total of 83 boys, including Jamie Bell who played Billy Elliot in the award-winning film, have now performed the title role around the world.

• The musical has won more than 80 awards worldwide including the Laurence Olivier Best Musical Award (London), the Helpmann Award for Best Musical (Australia) and 10, 2009 Tony Awards including Best Musical (Broadway).

• The musical topped the UK and Ireland box office when it was broadcast live from West End on Sunday, September 28, 2014, at 2pm in cinemas across the UK and around the world.

• The musical has had 4,216 performances at the Victoria Palace Theatre, including the 10th anniversary performance.