Newspaper headlines: 'Cummings declares war on PM' and 'No masks by the summer'

Saturday's front pages are dominated by Dominic Cummings' attack on the prime minister.

The i is one of many to say the former Downing Street chief adviser's blog post declared war on Boris Johnson. The paper's editor Oliver Duff calls it a character assassination "motivated by bug-eyed revenge", made all the more remarkable by the "blind loyalty" the PM showed him last summer.

The Sun questions why Mr Johnson risked incurring the wrath of his former strategist when the leaks of text messages between himself and the businessman Sir James Dyson "were not even seriously damaging".

The leader in the Times says the matter calls Mr Johnson's judgement into question and puts the focus firmly on the issue of his integrity.

Elsewhere, the papers feature the sub-postmasters cleared of financial crimes by the Court of Appeal on Friday.

The Sun's leader urges action to be taken against the Post Office bosses who pushed for the prosecutions, saying "the scale of the injustice boggles the mind".

Writing in the Daily Express, Reverend Richard Coles - who has campaigned for the convictions to be overturned - calls for those responsible to be held to account to ensure trust can be restored in the company and the entire justice system.

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The former Olympic long jump champion, Greg Rutherford, has told the Guardian he is aiming to become the first British person to win a medal at a summer and winter games.

The 34-year-old, who retired from athletics in 2018 - six years after winning a gold medal in London 2012 - is aiming to be selected for the Team GB bobsleigh squad for next year's Winter Olympics.

He tells the paper he believes he's got a "100% chance" of making the podium in Beijing, despite still having never actually sat in a bobsleigh.

Finally, the Times reports on a trial of new satellite technology that could make visiting tourist hotspots around the UK a much less stressful experience.

The system analyses the number of cars parked at popular destinations to assess how crowded they are likely to be, and can even work when there is heavy cloud cover.

A trial will be launched in Cornwall, the Lake District and Northern Ireland next year to test its effectiveness, with tourists able to input their travel plans and be advised on better times to visit desirable places, or be recommended good alternatives.