They said the move was recommended by the Joint Biosafety Center after a steady decline “in COVID-19 cases in England, Scotland, Wales and Northern Ireland.
Level 4 means the virus is in the general circulation and transmission is high or exponentially increasing, while Level 3 means the epidemic is in the general circulation.
In a statement, the UK chief medical officer of health said: “There has been a steady decline in cases, we have seen it across all four nations, and it continues.
“This does not mean that the pandemic is over. The virus is still in the general circulation, and outbreaks of epidemic are likely to occur.
“We have made progress against the virus thanks to the efforts of the people and we need the public to continue to follow the directions carefully to ensure that this progress continues. ”
Health Secretary Matt Hancock said moving to a lower alert level was “a great moment for the country, and real testimony to the British people is determined to beat this virus.”