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Health officials are investigating whether a Covid variant first found in India spreads more easily and evades vaccines.

There is not yet enough data to classify it as a "variant of concern", a leading scientist has said.

But Dr Susan Hopkins of Public Health England said cases had been found in the UK that were not linked to travel, with their origin being investigated.

As surge testing took place in south London after cases of the South African variant were found, how concerned should we be about Covid variants?

Health Correspondent Deb Cohen reports.