Immunity against coronavirus may only last a few months after infection, according to researchers at Imperial College London. They say the number of people testing positive for antibodies - a key part of our immune defences - fell by around a quarter between June and September. The fall in immunity was greatest in those over 65. They're warning everyone to adhere to government guidance on hygiene, social distancing and so on, even if they've already had the virus. 

Meanwhile, the BBC's medical editor Fergus Walsh has gone back to a Covid intensive care ward - six months after he became the first UK journalist to report from one. Find out what's changed.

Fifty-four Conservative MPs have written to Boris Johnson, asking him to set out a "road map out of lockdown" for areas in the north of England. They warn the pandemic is threatening to undermine a promise to "level up" the country, and say voters will turn away from the PM if they feel "forgotten". They're calling for a Northern Economic Recovery Plan to guarantee investment in job creation and big infrastructure projects. It comes alongside a warning today that northern England schools are also facing the greatest disruption during this time.

Warrington is the latest area to enter the highest level of coronavirus restrictions, and by the end of the week, eight million people across the North and Midlands will be in that position. See what tier three means in practical terms, and what support those regions are getting. Liverpool was the first to enter that top tier, but Mayor Joe Anderson - who lost his brother to Covid-19 - says he'd back an even higher one if it would tackle the virus spread. 

Scotland is set to introduce a five-tier system in the coming days, while in Wales, the row continues over restrictions imposed on shopping during the current nationwide lockdown. There are also worries from the Welsh tourism sector about what will happen when the "firebreak" is over.

With a week to go until the US election, President Donald Trump has landed a significant victory - the confirmation of his pick for the Supreme Court. All but one of his fellow Republicans in the Senate backed the appointment of Judge Amy Coney Barrett, defeating Democrats who were fiercely angry at the move so close to a potential change of president.

The Supreme Court is often the final word on highly contentious laws and Justice Barrett's appointment cements a 6-3 conservative majority. Previous rulings and writings by her have led some to fear for the future of abortion rights and the Affordable Care Act - healthcare reforms introduced by President Obama. She, though, insisted, she would be independent from Congress, the president and "the private beliefs that might otherwise move her". Read more on ACB and why America's top court is so much more political than the UK's.

All our coverage of the US election is gathered here. Among the latest stories, we ask whether Florida is (again) key to the result, and why postal voting has been so controversial. Get a really simple guide to the whole thing too.

Several papers lead with that letter from Conservative MPs demanding a lockdown exit strategy. According to the Daily Mail, it's a "revolt" by "red wall MPs" - and "a significant challenge" to Boris Johnson because there are "enough MPs to overturn his Commons majority". The school meals row rumbles on too. The Daily Mirror uses an image of the PM serving hospital food and asks "Can't you feed the nation's hungry kids too?" In a play on words referring to his public school education, the Daily Star condemns his policy as an "Eatin' Mess", while the Metro says a "volunteer army of caring Britons" has "stepped up to the plates" instead. According to the Daily Telegraph, Mr Johnson is preparing to give councils extra money to allow holiday clubs to provide children with at least one free meal a day outside term time. Combining the offer with extra study time for pupils catching up after lockdown would allow ministers "to argue it was a planned policy, rather than an about-turn". Elsewhere, the Sun believes it'll be "all fright on the night" after Downing Street suggested trick-or-treating would be permitted in tier one and two areas. "Millions of fun-starved kids" can "take part in the ghoulish festivities" as long as they follow the rule of six and stay out of people's homes, it adds.

When Kim Kyeong Yeon's 13-year-old daughter fell and injured herself on an escalator, she set in train events that years later might prevent millions of people around the world from contracting Covid-19. Business reporter Je Seung Lee explains more. Elsewhere, find out why one little girl's birth has prompted a nationwide ethical debate in India. And meet the rising indie band who've found themselves playing a gig in a circus instead of supporting Paul Weller.

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