The UK government on Wednesday reported 106,122 new virus cases in the last 24 hours, the first time the daily figure has topped 100,000, as the Omicron variant spreads rapidly.
The UK is one of Europe's most affected by the virus with 147,573 deaths since the pandemic began and more than 11 million positive cases. The government is urging the public to get third vaccine jabs and more than 30 million have received boosters so far.
Meanwhile, British regulators on Wednesday approved Pfizer's Covid-19 vaccine for use in children aged five to 11, as the country reported more than 100,000 new daily cases for the first time amid surging Omicron variant infections.
The developments came after the government said it was cutting the isolation period required for positive cases and Wales followed Scotland in unveiling new post-Christmas curbs, primarily around hospitality and large events.
Britain's Medicines and Healthcare products Regulatory Agency (MHRA) said it had approved a new lower-dose formulation of the Pfizer-BioNTech shot after finding it was "safe and effective" for children aged five to 11.
MHRA chief executive June Raine said there was "robust evidence to support a positive benefit risk for children in this age group".
The "overwhelming majority" of reported side-effects from the two-shot "age-appropriate" jab related to mild symptoms, such as a sore arm or a flu-like illness, she added.
The Joint Committee on Vaccination and Immunisation, which advises UK health departments on immunisation, said it was now advising offering a primary course of the vaccination to some within the age group.
Britain is in the midst of a stepped-up booster campaign, as it tries to minimise the impact of weeks of rising Omicron infections, aiming to offer a third jab to all adults by the end of the month.
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