, he said: "We've now got a much stronger vigilance in place, because everybody coming into the country has to be tested and we sequence the results of those tests.
"And we've also got a very strong set of actions working with the local authorities very specifically in the areas where a new variant is found.
"We hit it hard and send in enhanced contact-tracing and go door-to-door.
"We've now got this programme in place to be able to really, really try to stamp out a new variant where we see it. There is evidence that is working."
The variant was first found in the country in December and experts have warned that it can spread at a faster rate than others - with hundreds more undetected cases thought to be in the country.
Out of several new variants of Covid which have spread in the UK since the end of 2020, the three of most concern emerged in Kent (B1.1.7), South Africa (B.1.351) and Brazil (P.2).
The South African variant has a mutation called E484K, which scientists believe could make vaccines less effective.
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