India, Sept. 21 -- The United Kingdom could see 50,000 new Covid-19 cases every day by mid-October if no swift action is taken, top experts warned on Monday, as the Boris Johnson government considered imposing another national lockdown to curb the spread of the virus.

Chief scientific officer Patrick Vallance and chief medical officer Chris Whitty said the number of cases is doubling every seven days. For the first time in recent months, they appeared on live television without a minister present to report the new data described as "critical".

"If, and that's quite a big if, but if that continues unabated, and this grows, doubling every seven days...you would end up with something like 50,000 cases in the middle of October per day", Val...