A musical stage adaptation of Back To The Future will be hit by delays after the director, Jamie Lloyd, walked out in a bust-up over creative differences with writer Bob Gale, who penned the movie, its sequels and the upcoming musical script. The sci-fi adventure comedy, starring Michael J. Fox and Christopher Lloyd, was a smash hit movie in 1985, and a musical stage version was scheduled to premiere in London's West End in 2015 to coincide with the film's 30th anniversary. Announced in January, the musical was due to have a book by Lloyd, Robert Zemeckis and Bob Gale. It has music and lyrics by Alan Silvestri and Glen Ballard. Workshops for the show were due to be staged but now Gale will rewrite the entire script and send the new version to directors next year. The musical production is now expected to remain in development until 2016.