Mower, who originally shared the role with George Maguire and James Lomas, has commented in a press statement, "I still vividly remember the first time I stepped out on to the stage at the Victoria Palace Theatre almost ten years ago - it was terrifying and thrilling all at the same time. I was 12 years old and that was my very first time performing in front of an audience. Along with George and James we had been rehearsing the show for many months and to bring the story of Billy Elliot to life on stage was really exciting. I was unbelievably honored to be asked by Stephen Daldry to come back and rejoin the cast as Older Billy for this special performance, and, to step in to Billy Elliot’s ballet shoes for one more time will be a real privilege."
Mower, who began dancing at the age of nine, attended the Northern Academy of Performing Arts. Two years later he became a pupil at White Lodge, the full time boarding school of The Royal Ballet. In 2004, Liam beat over 3,000 hopefuls to be cast in the role of Billy Elliot, a role he played from March 2005 for almost a year and a half. In 2006, he became the youngest person ever to win the Olivier Award for Best Actor when he received the accolade along with James Lomas and George Maguire.
Shortly after leaving the West End, he was cast as Mikey Adams in "Wire in the Blood" for ITV. He completed his training at the Rambert School of Ballet and Contemporary Dance with a first class BA (Hons) degree, and during this time toured with Rambert Dance Company, performing Itzik Galili’s A Linha Curva. For New Adventures, Liam has performed in Matthew Bourne’s Nutcracker!, Tony in Play Without Words and made his principal debut as Count Lilac in Sleeping Beauty, also playing the role of Tantrum Fairy, with seasons in the UK, Italy, Russia and the USA. Most recently, Liam played the role of The Prince in Matthew Bourne's Swan Lake, the same ballet that forms the final scene in the film "Billy Elliot."