direct to your inboxThe professor who led research into the University of Oxford's Covid-19 vaccination has issued a dire warning about the possible impact of the relaxation of coronavirus restrictions over Christmas.Sarah Gilbert joined NHS bosses in expressing fears about a third wave of the pandemic in the new year, just as Germany announced a hard lockdown because of record numbers of cases and deaths there.Although cases are falling in Tier 3 Greater Manchester, the infection rate for England is rising and soaring in Tier 2 London where schools in Greenwich have been asked to close from Monday to tackle a worrying spike in cases.Restrictions are due to be relaxed across the UK between December 23 and 27 to allow families to form.