Robert Jenrick defends government’s 12-week vaccine dose strategy and says it means millions more can get first Covid jab after top doctors called for it to be cut to six weeks amid fears a long wait between doses is less effective Housing Secretary said millions more can get 'high level of protection' from first dose 'as quickly as possible' In a private letter to Professor Chris Whitty, British Medical Association recommended to cut 12-week delay Trade union called for an 'urgent review' of current policy, warning it is 'proving evermore difficult to justify' World Health Organization previously said the gap between first and second doses should be 21-28 days