TV presenter Kirsty Gallacher has teamed up with Sainsbury's to help launch Sport Relief's official merchandise, running across London's Serpentine Lake wearing the new Sport Relief t-shirt.

Gallacher is encouraging the public to get involved, either by signing up to the Sainsbury's Sport Relief Games or purchasing the official Sport Relief merchandise, available exclusively from the supermarket. Gallacher commented 'When Sainsbury's asked me to get involved and run across water, I wanted to give it a good go as Sport Relief is all about taking part and doing yourself proud'.