Morning mail: Boris Johnson refuses to quit, Kyrgios makes Wimbledon semi-finals, veggies to buy this month

Thursday: Covid-19 led Australia to record 3,105 more deaths than expected in January and February. Plus: UK prime minister told to step down by his own ministers

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Good morning. A fourth Covid vaccine is to be made available to more Australians as it was revealed hospital admissions have reached their highest levels since early February. In the UK, Boris Johnson has been told by his own ministers to quit. And Nick Kyrgios is through to the semi-finals of Wimbledon.

Johnson's woes have continued amid a string of resignations from his collapsing government and a series of senior Conservatives called for him to step down. But the PM is refusing to budge, even after a delegation of cabinet ministers met him at Downing Street to demand his resignation on a day of rapidly unfolding political drama. Follow all the latest developments as they happen here.