Coronavirus
'It was a serious error of judgement at a time when Londoners were making immense sacrifices,' the former London mayoral hopeful said.
As Boris Johnson and Chris Whitty tell us to cut back on socialising, how many people is too many?
Some 78,610 infections reported as Omicron surges.
Hallett, who previously led the inquest into the 7/7 London terror bombings, will oversee the probe due to begin in the spring.
"Will the prime minister take time this Christmas to look in the mirror and ask himself whether he has the trust and authority to lead this country?"
Signs of the new strain are different to traditional Covid. Here's what to watch out for.
Dr Jenny Harries also said a wave of infections could put the NHS in 'serious peril'.
"We will continue to support each other in the knowledge that our lives will never be the same without him."
A photograph emerged of a Christmas party thrown by Tory aides during coronavirus restrictions last Christmas.
Future Covid vaccines could use air instead of needles.