official song of the 2012 Summer Olympics' mascots Wenlock and Mandeville. The song features vocals from him and his sister Carrie Hope Fletcher. He also wrote the song "I Want" for One Direction's debut album Up All Night, and co-wrote (with Dougie Poynter and Danny Jones) "I Would" for their second album Take Me Home and "Don't Forget Where You Belong" for their third album Midnight Memories. He has co-written several songs with James Bourne including "Chills in the Evening", recorded by V. He also co-wrote "High Hopes" along with all four members of the Vamps for their debut album, Meet the Vamps. Fletcher is also credited as having co-written the 5 Seconds of Summer track "Try Hard". The song was originally released on YouTube on 1 June 2013, and in 2014 featured as a B-Side to their hit single "Don't Stop". He also cowrote the song "Own This Town" with the British band Chapter 13 for their Britain's Got Talent semi-final performance. Children's books Fletcher released his first children's book in 2012. Co-written with band-mate Dougie Poynter, The Dinosaur that Pooped Christmas sold more than 72,000 copies and became the most popular debut children's book of 2012. A follow up titled The Dinosaur that Pooped a Planet was released on 29 August 2013. Fletcher released his first solo novel, The Christmasaurus, on 6 October 2016, about a young boy called William Trundle who goes on a magical adventure on Christmas Eve. On 6 October 2017, a musical version of the book, entitled The Christmasaurus: Musical Edition, was released. On 21 March 2019, Fletcher released his second novel and released a Lead single from the soundtrack to THE CREAKERS: THE MUSICAL EDITION called "Don't Turn Out The Light" (featuring Chapter 13) from Britain's Got Talent, along with a music video. Fletcher released The Christmasaurus and the Winter Witch in October 2019, a sequel to his first solo novel The Christmasaurus. In November 2020, a series of Fletcher's books appeared in McDonald's Happy Meals as activity packs, including stickers. Other work In 2008, Fletcher contributed to the short story anthology Wow! 366. Fletcher and the other members of McFly released their memoir Unsaid Things... Our Story in the autumn of 2012. In June 2011, Fletcher appeared on the ITV game show The Cube and became the third person to win £100,000. He gave the money to Comic Relief and BIRT. Later