Kate Middleton wore a gorgeous and festive red cardigan worth £1,350 in the new trailer for her and Prince William’s Westminster Abbey Christmas carol concert Together at Christmas.The programme, which has been filmed already and will be shown on ITV on Christmas Eve after the royals reportedly "banned" it from showing on BBC One, showcases a number of celebrities taking part in the concert.The concert will feature a number of different performances and will see the royal couple at their best as