A delay in implementing lockdown restrictions by the government saw the number of those infected with Covid-19 rise by 1.3m in just over one week, according to reports.

An investigation by the Sunday Times’s Insight team found Boris Johnson’s hesitance in imposing measures saw cases rise from 200,000 on March 14 to 1.5 million on March 23.

During this time, the Government deliberated on the timing and scale of the lockdown.

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The increase in cases during this time is shown in a study by Imperial College London’s pandemic modellers and Oxford University’s department of statistics.

The study used backward modelling to calculate that the rate of infection was doubling every three days on March 14 – the date it is believed the Government first agreed that lockdown measures would be necessary to curb the virus’s spread.

HEALTH Coronavirus(PA Graphics)

Professor Peter Openshaw, a member of the Government’s Nervtag (new and emerging respiratory virus threats advisory group), told the paper: “I think that critical period of delay made the big difference to the peak numbers, both of hospitalisations and of deaths.

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“I think everyone would accept now in retrospect that if we’d gone for lockdown a couple of weeks earlier that would have greatly reduced the numbers of hospitalisations and deaths.”

In a statement to the paper, a spokesman said the Government’s strategy throughout the pandemic has been to protect the NHS and “save lives”.

“It has been vital through this global pandemic to make interventions which the public can feasibly adopt in sufficient numbers over long periods.”