The NHS has Bean preparing for the biggest program of mass vaccination in the history of the UK, and that's going to begin next week.

The first phase will include care, home residents, health and care staff, the elderly and those who are clinically extremely vulnerable.

But there are immense logistical challenges.

Each person needs to injections three weeks apart, so it will inevitably take some months before all the most vulnerable are protected and use treatments testing on vaccines.