Brits have been urged to follow social distancing rules in the hot weather or risk causing a spike in coronavirus.
Chief medical officer for England Professor Chris Whitty wrote on Twitter: "Covid-19 has gone down due to the efforts of everyone but is still in general circulation.
"If we do not follow social distancing guidance then cases will rise again.
"Naturally people will want to enjoy the sun but we need to do so in a way that is safe for all."
This comes as health leaders are calling for an urgent review to ensure Britain is properly prepared for the "real risk" of a second wave of coronavirus.
Ministers have been warned that urgent action is needed to prevent further loss of life and to protect the economy amid growing fears of a renewed outbreak over the winter.
The appeal is backed by the presidents of the Royal Colleges of Physicians, Surgeons, GPs and Nursing - as well as the chairman of the British Medical Association.
It comes after Boris Johnson announced on Tuesday the biggest easing to date of the coronavirus lockdown in England.
The Prime Minister said the two-metre social-distancing rule would be replaced with a "one-metre plus" rule paving the way for pubs, restaurants, hotels and cinemas to begin reopening from July 4.
