astra-zeneca
The UK will become the first country in the world to start using the jab, just days after it was approved.
The government issued guidance on New Year's Eve saying it was "reasonable" for two different vaccines to be given to the same patient if one type was unavailable.
Middle of January boost comes amid a record surge of infections driven by a highly contagious form of the virus.
Matt Hancock said he was confident enough vulnerable people would be protected by spring to "allow us to get out of this pandemic".
The jab is the second to be approved after the Pfizer/BioNTech vaccine.
Scientists say they have found the 'winning formula'.
Team spirit, hard work and extra hand washing – scientists working on the Oxford University trial talk about the project of a lifetime.
Unit formed to fight Scottish independence is said to have asked vaccine taskforce about branding Oxford injection kits.
Matt Hancock previously said the NHS could start vaccinating people next month if a jab was approved.
Concerns had been raised about results from one part of the initial Oxford University and AstraZeneca trial.