Coronavirus could potentially cost one million jobs in Britain this year, with most losses anticipated during the current third quarter, according to a study published on Monday.

Job losses could hit 450,000 between July and September, the Institute for Employment Studies forecast in a report, warning this could worsen to 690,000 positions under a worst-case scenario.

Another 200,000 cuts could follow in the fourth quarter, or three months to December, the research group predicted.

Recent official data showed that Britain has already shed around 240,000 jobs in the first six months of 2020.

The latest IES forecasts, based on official Insolvency Service data, could therefore bring the annual total to more than one million.

"This data lays bare the scale of the jobs crisis that we're facing in the autumn," said IES director Tony Wilson in the study.

"The sad reality is that this restructuring cannot be averted entirely, but we can do a lot more to minimise the job losses and support those who are most at risk," he said.

The dire IES forecasts come amid growing concern about the end of the British government's jobs retention plan which was launched in the wake of the March 23 nationwide virus lockdown.

In October, the UK government will wind up the so-called furlough scheme, under which it has paid up to 80 percent of private-sector wages for around ten million workers during the pandemic.

Analysts have repeatedly warned this would result in soaring unemployment across Britain.

"There are still many parts of the economy where perfectly viable businesses cannot bring people back because of the ongoing disruption caused by the pandemic," warned Wilson at the IES.

"So we need tightly targeted support to help these firms ride out the next few months, where they can commit to not laying staff off."

Britain's economy shrank by a fifth in the second quarter, more than any European neighbour, as the lockdown plunged the country into its deepest recession on record.