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Early analysis of UK Omicron and Delta cases showed the vaccines were less effective at stopping the new variant.

But a third booster prevents around 75% of people getting any Covid symptom.

Meanwhile, Levelling Up Secretary Michael Gove, who chaired a meeting with first ministers of the devolved nations this afternoon, warned the UK faces a "deeply concerning situation".

Should the government act preemptively at the risk of doing so prematurely, and with tangible economic damage? Or should they wait?

But as the UK reports another 58,194 daily Covid cases - the highest daily total since 9 January - tough judgement calls await.

Newsnight’s David Grossman reports.