New self-isolation penalties come into force today, as the coronavirus infection rate continues to surge in England.
Those who test positive now face a £10,000 fine if they fail to self-isolate or refuse to cooperate with track and trace guidelines.
The new fines start at £1,000 and rise up to £10,000 for repeat offenders or those in serious breach of the rules.
It also includes a penalty for those who knowingly provide false information about who they have come into contact with to the test and trace service.
The Department of Health and Social Care (DHSC) warned that from Monday, police will check compliance in the highest incidence areas and in high-risk groups based on “local intelligence”.
High profile and “egregious” cases of non-compliance will be investigated and prosecuted, while action will be taken on tip-offs from “third parties” about people who have tested positive but are not self-isolating, the DHSC said.
From Monday, weddings will be limited to just 15 people as new measures come into force to tackle the so-called second wave.
It follows new lockdown restrictions in large parts of the UK, over fears a fall in temperature could trigger another spike in fatalities.
Restrictions in Wigan, Stockport, Blackpool and Leeds were all tightened on Saturday, while stricter rules are already in force across large swathes of north-west England, West Yorkshire, the North East and the Midlands, as well as parts of west Scotland.
Meanwhile, three more council areas in South Wales will go into local lockdown from 6pm on Monday.
Neath Port Talbot, Torfaen and the Vale of Glamorgan will all be affected, and residents will not be able to enter or leave the areas without a reasonable excuse.
They will not be able to meet indoors with anyone they do not live with, with extended households suspended.
The new restrictions mean an estimated 17.8million people across the UK will be living under additional coronavirus measures by Monday evening – on top of those announced by Prime Minister Boris Johnson.
Health Secretary Matt Hancock said the government will “not hesitate” to introduce further measures if case numbers continue to rise.
He added: “Anyone can catch coronavirus and anyone can spread it.