Up to three cases of highly transmissible variant have been found in England and a further three in Scotland
The government is facing urgent calls for tougher border measures after UK officials said they were searching for one of six people infected with the highly transmissible Brazilian coronavirus variant.
Public Health England said on Sunday that three cases of the variant had been detected in England and three in Scotland, but that the identity of one of those carrying the virus was unknown as they had not provided their contact details.