If you want to receive twice-daily briefings like this by email, sign up to the Front Page newsletter here. For two-minute audio updates, try The Briefing - on podcasts, smart speakers and WhatsApp. The Christmas dilemma: To hug or not to hug? You might have arranged your Christmas "bubble", but have you decided who you will hug? Despite guidance suggesting there would be no need to maintain social distancing within this group, the chief medical officer has warned family members not to hug elderly relatives. Professor Chris Whitty said that just because close physical contact between people from three different households will be legal over the festive period, that does not mean it is safe. "Would I encourage someone to hug and kiss their elderly relatives?" he said. "No I would not… if you want them to survive to be hugged again." The sobering warning came at last night's Downing Street briefing as he told the public to "take it really seriously during Christmas. Don't do stupid things". Read our simple guide to what you can, cannot and probably should not do over Christmas. Meanwhile, Prime Minister Boris Johnson is facing a Tory rebellion after the Government's "authoritarian" and "unfair" new tier system left 34 million people facing tougher restrictions than before lockdown. MPs were described as being "in open revolt" after 98 per cent of England's population were placed in Tiers 2 and 3. Chief Reporter Robert Mendick has the inside story on the tiers chaos. Our data analysis shows how millions have been plunged into stricter lockdowns. This is why Slough has been singled out for Tier 3 while its neighbours will enjoy more freedom. And use our postcode tool to check your area. Extra trial for Oxford jab to prove elderly protection The Oxford coronavirus vaccine was announced on Monday to be "up to 90 per cent" effective against Covid-19. But good news fades fast. Now drug company AstraZeneca is to run an extra trial amid growing questions about the performance of the jab. It is seeking to satisfy regulators after US health officials announced no one in the test group with the highest efficacy rates was over 55. As Health Editor Laura Donnelly reports, that sparked concern because the jabs will be targeted at the elderly first. Global Health Security Editor Paul Nuki says the Oxford trial results raise more questions than answers. Duchess offers parents advice from the heart The Duchess of Cambridge will today declare that only a quarter of parents understand the critical importance of early childhood, as she warns that poor care during the first five years can result in family breakdown, addiction and homelessness. She will refer to the biggest study of its kind in the UK, which concluded parents needed better support and access to information from "society as a whole". Victoria Ward has more from the report commissioned by the Royal Foundation. At a glance: More coronavirus headlines Hunters | WHO unveils team of 10 scientists to trace Covid origins Treatment | Trial to investigate use of inhaled steroid at home Railways | See family on Zoom to avoid chaos, ministers say Travel | Will hotels check which areas guests have come from? Savings | Lockdown splurge may herald new 'Roaring Twenties' Also in the news: Today's other headlines Exclusive | Eton College dismissed one of its masters amid a free speech row prompted by a lecture that questioned "radical feminist orthadoxy". The £42,500-a-year boarding school was accused of "prioritising emotional safety over intellectual challenge" after it allegedly banned a presentation on the theme of masculinity from being delivered. Slavery row | Fears for Churchill, Nelson and Gandhi statues 'Game-changing' | NHS to offer blood test that finds 50 cancers BBC news | Lowest impartiality score of any British broadcaster Electric cars | 50k miles before carbon footprint less than petrol News quiz | Name the Cambridges' dog that died this week Around the world: Sad farewell to El Diego Navigating life in a world without Diego Maradona, crowds in the Argentinian capital sought a collective embrace as they queued to see his coffin. Read Natalie Alcoba's dispatch from Buenos Aires. Matt remembers Maradona in today's cartoon and look back at his life here.