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With the UK in lockdown and a new faster-spreading variant of coronavirus rampant, the country is in a race to vaccinate.

Prime Minister Boris Johnson wants all the over-70s, the most clinically vulnerable and front-line health and care workers to be offered a jab by mid-February, to allow the restrictions to be eased. Is the UK on track to achieve this?

There have also been concerns around the change of vaccination strategy, which poses ethical and logistical challenges for the rollout.

The delay of a second dose is hugely contentious in the scientific community, so how well will a single dose work?

Health Correspondent Deb Cohen reports.