People are being urged to report their neighbours who have coronavirus but aren't self-isolating with cheats set to be fined up to £10,000.
Police will be undertaking quarantine spot checks in high-risk areas based on "local intelligence" as strict new rules are imposed from today.
High profile and "egregious" cases of non-compliance will be investigated and prosecuted, the Department of Health and Social Care (DHSC) said.
PM Boris Johnson, meanwhile, faces a Commons defeat on Wednesday as Tory rebels continue to press the Government to give MPs a chance to vote on coronavirus measures before they come into force.
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