Britain could implement tougher COVID-19 measures. | HANNAH MCKAY

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Britain could implement tougher COVID-19 measures, including advice to work from home, as early as Friday, according to a government source cited by Times Radio on Thursday.

"Rumours abounding of an imminent Quad meeting to discuss imposing Plan B as early as tomorrow morning, meaning Working From Home and COVID passports for large venues.

One source tells me it's '85% likely'," Times Radio presenter Tom Newton Dunn said on Twitter.