What is the Covid Alert Level system and what do the changes mean?

Hereford Times Friday, 19 June 2020 ()
The UK’s chief medical officers have agreed to downgrade the Covid alert level from four to three following a 'steady' decrease in cases.
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News video: Coronavirus alert level downgraded as cases continue to fall

Coronavirus alert level downgraded as cases continue to fall 00:31

 The UK’s chief medical officers have agreed to downgrade the coronavirus alert level from four to three after a “steady” and continuing decrease in cases in all four nations.