COVID-19: 'Biggest surge testing operation to date' under way as dozens of South African variant cases found in south London

The largest surge testing operation so far is taking place in areas of south London after more than 70 confirmed or probable cases of the South African variant of COVID-19 were detected. The government says dozens of people are isolating or have completed their isolation after contracting the variant, B.1.351, and the cluster of infections is believed to be 'significant'.