Former Prime Minister Tony Blair said Britain must step up its testing regime and test "virtually everyone" to contain the coronavirus.
The ex-Labour leader said he was sure that the Government was working flat out to contain the virus but that mass testing was needed in the fightback.
Mr Blair said that a point will be reached where a "very large" proportion of the entire population is tested for coronavirus.
He said: "Your risk, obviously, is as you start to ease the lockdown, how do you then deal with any resurgence of the disease?