This evening's briefing was introduced by the Prime Minister:

We are collectively telling, telling cafes, pubs, bars, restaurants to close tonight as soon as they reasonably can, and not to open tomorrow.
We’re also telling nightclubs, theatres, cinemas, gyms and leisure centres to close on the same timescale.
And I want to stress that we will review the situation each month, to see if we can relax any of these measures.
And listening to what I have just said, some people may of course be tempted to go out tonight. But please don’t.
You may think you are invincible, but there is no guarantee you will get mild symptoms, and you can still be a carrier of the disease and pass it on to others

It was followed by a briefing from the Chancellor of the Exchequer, introducing: