In the UK, non-compliance with self-isolation orders could result in fines of up to £ 10,000 (€ 10,950), the government said.
The new rule, which will take effect on September 28, stipulates that people must adhere to self-isolation if they are infected with the new coronavirus or are identified as close contacts with an infected person.
Until now, self-isolation in Britain in such cases was recommended, but not mandatory.
The new fines will also take effect on September 28. Initially, a fine of £ 1,000 will be imposed, but for repeated infringements, the fines will be higher, up to £ 10,000.
The government has provided a one-off £ 500 benefit for low-income people for whom self-isolation means loss of income, and penalties for employers who turn against self-isolation for their employees.
The British government is expected to impose further restrictions as Prime Minister Boris Johnson confirms that a second wave of infections has begun in the country.
The mayor of London has also said that restrictions in the capital may soon have to be tightened.