David Walliams, Rebecca Adlington and Ellie Simmonds have helped launch this year's British Gas SwimBritain, which aims to encourage people across the UK to take part in swimming relays and inspire them to participate in the sport more regularly.

British Gas will donate £1 for every participant involved to Shelter, and other ambassadors for the campaign include Duncan Goodhew, Hannah Miley, Keri-Anne Payne and Michael Jamieson.