The UK has recorded the highest number of daily Covid-19 cases since the beginning of the pandemic, with 78,610 reported on Wednesday.
The previous record was 68,053 on 8 January - when the UK was in lockdown.
Speaking at a news conference, England's chief medical officer Prof Chris Whitty warned that records "will be broken a lot" in the next few weeks.
He added people should "prioritise what matters" with regards to social mixing in the run-up to Christmas.