Actor Idris Elba, singer Craig David and model Suki Waterhouse are among UK celebrities who have recorded an interactive version of John Lennon’s hit Imagine as part of a global Unicef campaign. The single has been launched to celebrate 25 years of the Convention on the Rights of the Child – an international agreement by governments to recognise the needs of children. The Imagine project, which also features actor Hugh Jackman and singers Nicole Scherzinger and Katy Perry, is being supported by the late Beatles star’s widow Yoko Ono.