International travellers, including returning Brits, could face police spot checks and £1,000 fines if they fail to self-isolate on arriving in the UK.
Those coming into the country must provide an accommodation address where they will quarantine for 14 days under the measures to guard against a second wave of coronavirus.
Home Secretary Priti Patel is expected to outline the plans - which will be introduced early next month - at the daily Downing Street briefing later today, a senior Government official confirmed.
Border Force, police and Public Health England officers will run and enforce the quarantine measures, with 100 checks per day expected.
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