Musician Jamie Cullum joined Sadiq Khan in Trafalgar Square last night (December 8) for a one-off concert to raise awareness of the Mayor of London's winter rough sleeping campaign. The singer-songwriter performed tracks from his latest album ‘The Pianoman at Christmas – The Complete Edition’ and was joined by the Battersea Power Station Community Choir. The event supported the Mayor’s Winter Rough Sleeping Fundraising Campaign, raising funds for four London charities working to end youth homelessness.