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With another new variant identified, there are now nine on the UK's watchlist. Here's where things stand.
Boris Johnson boasts Britain has "one of the toughest border regimes anywhere in the world." So what do we know about what went wrong?
Vaccines minister Nadhim Zahawi said the government doesn't know whether the person contracted the virus in the UK or abroad.
The new strain may spread more rapidly and respond less well to existing vaccines.