Some 2.2 million people with serious underlying health conditions have been urged to stay home and avoid non-essential face-to-face contact under the guidance.
About 595,000 (28%) of them usually work, according to charities.
Protection counseling has now ended in England, Scotland and Northern Ireland.
The move comes as the government has postponed the easing of some lockdown measures some businesses that were hoping to reopen were told they had to stay closed for now.
Bowling alleys, casinos, ice rinks and beauty salons offering close contact services like facials had been scheduled to welcome guests today for the first time since the lockdown, while small receptions from wedding and indoor performances were due to resume.
Their doors will remain closed for at least two more weeks after an increase in COVID-19[feminine[feminine case in England.
A coalition of charities is urging Chancellor Rishi Sunak to protect the jobs of workers who have followed the advice, warning they will be put in an “impossible position” now that restrictions are relaxed.
An open letter signed by 15 charities, including Age UK and Macmillan Cancer Support, raises concerns that those who protect may be forced to choose between their health and their work.
The signatories warned that these employees risk being made redundant or could be forced to return to the workplace when they do not feel it is safe to do so.
The letter to Mr. Sunak says, “Our concern is that, especially as your leave arrangements begin to unfold and the protection program is halted from next week, some of these workers will find themselves in a impossible position.
“Indeed, if their profession is an activity that they cannot exercise from their home, and if it is extremely difficult to make their workplace safe for them, they may be forced to choose between putting their health at risk. on the way home or stay safe. by giving up their job. ”
The signatories say it is “desperately unfair” to those who have made “great sacrifices” by staying at home, and call on the Chancellor to act and protect their jobs as well as support employers.
This could include extending the leave program for those who have protected or are at high risk, the letter adds.
The same suggestion was made by the TUC, with Secretary General Frances O’Grady telling the Guardian: “It would be ruthless and reckless for employers to demand the immediate return of protection workers.
“After self-isolating for several months, requiring protection workers to go to their workplace immediately can cause anxiety.
“The job retention program is in place until at least October, so employers should continue to use it if working from home is not an option. ”
A Macmillan Cancer Support survey of 2,000 adults found that many cancer patients are afraid to return to their workplace, with 42% saying they feel it is currently unsafe for them to work outside of their workplace. their home.
One in three (36%) people with cancer reported coronavirus The crisis has affected their finances, with some claiming to have difficulty paying their bills.
At the same time, a survey by Asthma UK and the British Lung Foundation of nearly 4,000 people doing protection in England suggested that a fifth (21%) would continue to do so until they were there is a vaccine.
Some 40% of those polled said they didn’t know what to do now that the protection counseling is over, and two-thirds said they will need to be happy the risk of catching coronavirus is low before stopping the shielding .
Employers have been urged to ensure armored personnel can work from home whenever possible, including transferring them to another position if necessary, according to the government.
If employers cannot provide a safe working environment against COVID, those who are clinically vulnerable will be able to access financial support, including sick pay and social benefits, he said.
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A government spokesperson said: “We understand how difficult the pandemic epidemic has been for those who are clinically vulnerable and we have worked tirelessly to support them.
“Employers need to ensure the safety of those in such conditions when considering working arrangements, including whether the work can be done remotely.
“Our extensive support package with an initial value of £ 160 billion includes the leave program, which paid the salaries of 9.5 million people and has already been extended through October, loans, grants , tax reductions and deferrals.
“People will now also benefit from the job retention bonus which will support businesses and protect jobs. We have also announced £ 750million for charities so that they can continue their important work, ensuring that those on the front lines are able to reach those who need help.