The first passengers are checking into UK government-designated coronavirus quarantine hotels.
New restrictions apply to passengers arriving in England from desigtnated "red list" countries - and all air travellers landing in Scotland.
People have to pay to spend 10 days in isolation.
The opposition Labour Party says the policy should apply to all international arrivals.
Health Secretary Matt Hancock says it's working well so far.
IN: "We've got...
OUT: ...hotels."
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