COVID daily cases jump 50% in a week to 18,450 as ministers threaten to CANCEL Christmas: Pressure on Boris to scrap five-day break from restrictions as Government crisis talks with other UK leaders fail to reach agreement Restrictions are supposed to be eased to allow up to 3 households to meet for 5 days over the festive period But scientists fear this could fuel new Covid variant that may be behind a surge of cases in southern England Urgent talks are under way in Whitehall on whether to tighten regulations in response to rising cases Leading medical journals have published rare joint editorial calling for the relaxation to be abandoned