23 Dec 2020, 15:24 Updated: 24 Dec 2020, 0:12 Invalid Date, TWO Brits have been diagnosed with another new and "highly concerning coronavirus mutation from South Africa", it emerged today. Matt Hancock said the new variant is even more contagious than another new strain detected in Kent and London earlier this month, which led to millions being plunged into Tier 4 restrictions over Christmas. 5 Matt Hancock today revealed a second new strain of the virus had been detectedCredit: AP:Associated Press The Health Secretary urged anyone who has returned from South Africa in the last two weeks to quarantine immediately - and said close contacts of any travellers should also self-isolate.