Also see response from Public Health England, as covered by The Guardian (Jan 2): https://www.theguardian.com/world/2021/jan/02/england-health-officials-defend

Also see response from Public Health England, as covered by The Guardian (Jan 2): https://www.theguardian.com/world/2021/jan/02/england-health-officials-defend-contingency-plan-to-mix-covid-vaccines https://www.theguardian.com/world/2021/jan/02/england-health...