Urgent testing for the South Africa-discovered variant of Covid-19 is underway in England after cases were discovered in several different locations.
Those in affected areas are being asked to take a test whether they have symptoms or not.
Infections were found in people with no travel history to South Africa, prompting fears about community spread of the strain.
Correspondent Rachael Venables is in one of the west London postcodes which is being included in the testing operation.
IN: "It's a...
OUT: ...targeted.'
DUR: 39 seconds