Terrified staff at web fashion giant ASOS stopped work after claiming it was impossible to keep two metres apart and follow social distancing guidelines at its HQ.
They also complained of cramped buses and shortages of alcohol hand sanitiser at the firm’s base in Barnsley, South Yorks.
One worker claimed: “The bosses said online shopping should be encouraged. But it’s almost impossible to socially distance. There’s a minimum of 500 people there.
“I’m sat 3ft from somebody. There’s somebody else 3ft away from me in another direction.”
But ASOS said: “We totally refute these allegations. We are striking the right balance between keeping our warehouse operational for the good of employees and the wider economy, and maintaining the health and safety of staff. An environmental health officer visited and was happy.”
Brits are being encouraged to work from home where possible in Britain, although key workers are exempt.
A lockdown barring people from leaving home apart from daily exercise and to buy essentials has been in place since Monday.
Boris Johnson is warning every household he could impose even stricter lockdown measures to tackle the coronavirus outbreak as it inevitably worsens.
The Prime Minister, who is self-isolating with Covid-19, is writing to every address telling people the closer they adhere to the rules "the sooner life can return to normal".
Stressing the "national emergency", the letters will land on doorsteps after the number of people to have died in UK hospitals surged past 1,000, increasing by 260 in 24 hours.
NHS England's national medical director warned on Saturday that now was not the time for complacency after a study suggested social distancing could deliver a lower death toll than previously feared.
Scottish Secretary Alister Jack became the latest Cabinet minister to enter self-isolation with Covid-19 symptoms after the PM and Health Secretary Matt Hancock.
Mr Johnson last week offered a glimmer of hope when he said he expects the UK can "turn the tide" within three months, but a lengthier estimate for the lockdown was offered by a scientist whose research has been key in the Government's approach.
Imperial College London's Professor Neil Ferguson told the Sunday Times: "We're going to have to keep these measures (the full lockdown) in place, in my view, for a significant period of time - probably until the end of May, maybe even early June."
The nation learned that the number of coronavirus-related deaths in the UK had hit 1,019, as of 5pm on Friday.
Meanwhile, work was rapidly going ahead converting London's ExCel convention centre into a field hospital dubbed the NHS Nightingale Hospital.
And to ensure hospitals can be sufficiently staffed, coronavirus tests were being trialled so frontline workers self-isolating with potential symptoms may be able to get the all clear and return to work.