The UK Health Security Agency, a public health protection body, said AY.4.2, which was last week seen in six percent of cases, had been "designated as a variant under investigation" but not yet a "variant of concern".

United Kingdom: Health experts probe Delta subvariant after rise in Covid cases

Earlier on Monday, UK PM Boris Johnson confirmed that the fourth stage of the lockdown roadmap dubbed 'Freedom Day' will be delayed by 4 weeks.

Cases of Delta variant of Coronavirus rising in the UK

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United Kingdom: Health experts probe Delta subvariant after rise in Covid cases

Cases of Delta variant of Coronavirus rising in the UK