Surge tests are to be carried out in two other areas where the South African variant of the coronavirus has been found.
The Department of Health has announced that an area of London and an area of County Durham will be targeted.
Testing and genome sequencing will be carried out in the North Wembley area of Brent in north London and TS19 postal code in Stockton-on-Tees in County Durham.
A statement by the department states: “The enhanced tests will be introduced in addition to the existing extensive tests and, in combination with the public in accordance with the current lockout rules and the instructions for the Hands Face Space, will help to monitor and suppress the spread of the virus .
“Positive cases will be sequenced for genomic data to improve our understanding of the Covid-19 variants and their prevalence in these areas.
“The improved contact tracking is used for people who test positive with a questionable variant. Contact tracers look back over a longer period of time to determine the transmission path.
“People living in the targeted areas are strongly advised to take a Covid-19 test when offered, whether or not they show symptoms.”