Families should isolate for at least ten days before Christmas if they want to celebrate with elderly relatives in the five-day break on Covid-19 restrictions.
The warning was issued by former Government chief scientific adviser Sir David King because of alarming infection rates among children.
It comes as Prime Minister Boris Johnson is facing his biggest rebellion yet with 100 Tory MPs threatening to vote against his strict new tiers system.
The new rules will place many areas under far tougher restrictions than they faced before the current four-week lockdown. Sir David said because Christmas is a “multi-generational time” it poses a “big risk” to those most vulnerable.
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