As-it-happened: Pfizer coronavirus vaccine '95% effective and safe' - BBC News
New data on the potential vaccine by Pfizer and BioNTech released on 18 November shows it's 95% effective and safe.
Earlier on, we reported that the head of NHS Test and Trace is self-isolating after receiving a notification from the NHS mobile app.

Baroness Dido Harding tweeted that she was "feeling well", and added: "Nothing like personal experience of your own products."

She joins a host of people in the same situation. Prime Minister Boris Johnson is self-isolating after meeting a Tory MP on Thursday who later tested positive for Covid-19, while today NHS England's medical director, Prof Stephen Powis, also revealed he was self-isolating after someone in his household tested positive.

But how does NHS Test and Trace work?

If a person tests positive for coronavirus, they can choose to share their result with the NHS app anonymously.

The NHS then sends alerts to other app users who have spent time near them or been in "close contact" - meaning they have been within two metres for 15 minutes or more.

Anyone who gets an alert is instructed to isolate for 14 days from when they had the contact.

Read our explainer here about how the app works, how contact tracing has been carried out and other questions you might have.