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The Queen's Covid diagnosis makes most of the front pages.

"One keeps calm and carries on" is the headline , which says she is "determined" to carry out some of her official duties after testing positive for the virus.

the Queen has gone from "HRH to WFH" as she is forced to work from home at Windsor Castle.

But says despite her illness "she's been thinking about her subjects" and even found time yesterday to send messages of congratulations to Team GB's curling medal winners at the Winter Olympics.

that other members of the Royal Family are "relaxed" about the Queen's symptoms, and are pressing ahead with their own engagements as planned - including the Duchess of Cambridge, who is due to visit Denmark.

that people over the age of 80 will still be eligible for free coronavirus tests once their availability is reduced as part of the government's plan for living with the virus.

It expects universal free kits to be phased out at the beginning of April, although hospital staff, patients and workers in care homes would also still qualify for them.

The paper says the proposals are still being finalised because of wrangling between the Treasury and the Department of Health.

, at least two Cabinet ministers will withdraw their support for Boris Johnson if he is given a fine for breaching Covid laws.

A source close to one of the ministers says that if the Metropolitan Police concludes Mr Johnson broke the regulations he drafted, "he'll have to go".

Scotland Yard is currently investigating 12 gatherings at Downing Street - six of them with links to the prime minister. He has previously denied any wrongdoing.

Away from Covid, the has a picture of a large peace rally in southern Ukraine on its cover.

It says that concerns about an imminent invasion have further increased after Belarus announced that 30,000 Russian troops taking part in joint drills would stay in the country indefinitely.

that Vladimir Putin insisted as recently as Wednesday that "not a single" Russian soldier would remain in Belarus once the drills ended at the weekend.

Meanwhile reports on the mystery of white symbols that have appeared on the side of Russian tanks and rocket launchers apparently heading for the Ukrainian border.

It says some of them have been daubed with the letter "Z" - the significance of which is unknown.

it might be an attack code or an attempt to avoid accidental friendly fire, because Russian and Ukrainian military equipment are similar in design.

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that Sir Paul McCartney will become the oldest artist to headline Glastonbury when he performs at the festival at the age of 80 this summer.

The line-up for this year's event is yet to be formally announced - but the paper says the former Beatle will head to Worthy Farm shortly after completing a tour of the US.

One insider tells the Sun that Sir Paul is "really excited" about Glastonbury "and determined to put on a hell of a show".