The three-tier system of coronavirus restrictions has come into force in England, imposing tighter curbs on socialising for millions of people in the Midlands and the North. The Liverpool region is the only area under the toughest rules right now, but talks are taking place about elevating Greater Manchester, Lancashire and a number of others into the "Very High" category. Here are five unanswered questions about the system.

With the ink barely dry on the new rules, pressure is growing on the prime minister to go further. Labour leader Sir Keir Starmer is calling for a so-called "circuit break" - a short-term period of lockdown to tackle the rise in cases. That was a plan recommended by the government's own scientists - as we explain. Polling suggests there's some desire for tougher action out there among the public. 

Pressure is coming from elsewhere too. Scotland has already imposed stricter rules across a large swathe of the country and Northern Ireland is set to be next. Stormont is expected to confirm later that schools will be closed for two weeks from Monday, and hospitality businesses will only be allowed to offer takeaway and delivery services for four weeks from Friday. Across Europe there are similar moves. The Netherlands and the Czech Republic have both announced partial lockdowns as they face a second wave of infections.

Can Boris Johnson hold out against going further, and indeed, should he? BBC political editor Laura Kuenssberg says he's at pains to stress how much restricting our freedoms bothers him, but will also be reluctant to leave himself open to the same sort of allegations he faced back in March that he acted too slowly. Downing Street has not ruled out a circuit break completely, but many of Mr Johnson's own MPs are not keen to go further for now, and the Treasury is especially reluctant because of the economic damage it would bring.

To the president "you're expendable". The words of White House challenger Joe Biden, speaking to elderly voters in the battleground state of Florida at his latest campaign event. With social distancing in place - a stark contrast to the president's rally the previous day - Mr Biden said Donald Trump's handling of the pandemic showed he didn't care about the risk of coronavirus to senior citizens. Latest polls do suggest a shift away from the Republican among older voters - it's an issue we've looked at in detail. Meanwhile, the president has also been attempting to woo a key demographic - suburban women - many of whom are said in opinion polls to view him unfavourably. He told them he had "saved your damn neighbourhood" by focusing on law and order. 

With just three weeks until the election, Mr Biden seems to have cornered at least one constituency: celebrities. But is that a good thing?

Australia's Great Barrier Reef is the largest living structure on Earth, but a new study has found it has lost more than half of its corals since 1995. Scientists say all types have suffered a decline due to warmer seas driven by climate change. Corals provide habitats for fish and other marine life, and can recover if normal conditions return. Recovery can take decades, though, and the researchers at the ARC Centre of Excellence for Coral Reef Studies in Queensland said there was "no time to lose" and "we must sharply decrease greenhouse gas emissions ASAP."

Many of the front pages focus on the call from Labour leader Sir Keir Starmer for a two-week lockdown. The Guardian sees Sir Keir as "heaping pressure" on the prime minister with "a significant escalation of his criticism" of the government's handling of the crisis. The Daily Mirror describes Sir Keir's suggestion as "sensible" and accuses the PM of "vacillating". The i agrees Sir Keir has broken the "Covid consensus" at the same time as the "united front" between Downing Street and its scientific advisers is "fraying". Some papers have a seen a document from those scientists, due to be published later, that suggests a "circuit break" could cut deaths by a third for the rest of the year. A senior source tells the Daily Telegraph there's an 80% chance of Boris Johnson agreeing to one, although the paper's editorial dismisses the plan as "madness". The Times says Mr Johnson actually "hardened his stance" during a call with Tory MPs on Tuesday night, arguing it would not be right to impose the restrictions on areas where cases were still low.

A camera-trap image of an Amur tiger has won the grand prize in the Wildlife Photographer of the Year 2020 contest. Enjoy that and the other beautiful images it pipped at the post. Elsewhere, after making a career out of sharing intimate details of her private life, Sunday Times columnist Dolly Alderton explains why she's changing tack. And finally, meet South Korea's all-female repair service, created for women who feel nervous about men knocking at their doors.

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