Coldplay have donated a signed Fender guitar to help raise funds for a Gloucestershire primary school.The coveted prize is being raffled off by Swell Co of E Primary School in the North Cotwolds, which has launched a new fundraising drive in a bid to finance a new extension.The new campaign, billed as “A Swell Christmas Raffle”, will also see ticket-holders getting the chance to win a state-of-the-art Peloton bike, a Magnum of champagne and vouchers from a selection of Cotswold