The Sunday Telegraph leads with what it says is an open revolt by grassroots Conservatives against Theresa May's plan for Brexit.
It says the prime minister and other cabinet ministers are facing an angry response from their constituency associations to the latest proposals and have been warned that they must not concede further ground to Brussels.
Ministers have drawn up plans to send in the Army to deliver food, medicines and fuel in the event of shortages if Britain crashes out of the EU without a deal, according to the Sunday Times.
It says blueprints for the armed forces to assist the civilian authorities have been dusted down as part of the "no deal" planning.
The paper says the revelations will spark renewed claims from Brexiteers that the government is engaged in scaremongering about the dangers of crashing out without an agreement.
The Sunday Express has accused a water company of urging members of the public to inform on neighbours who flout a hosepipe ban.
The paper says United Utilities is also encouraging its staff to turn in people they spot breaking the law by watering their gardens.
The water company for north-west England is imposing the hosepipe ban from next Sunday after its reservoirs fell to under 40% of capacity.
The news that farmers will be meeting Whitehall officials this week for an emergency summit on the summer drought makes it on to the front of the Observer.
The paper says they will address concerns about the fragility of the UK's food supplies.
The Sunday Mirror reports that police believe those behind the use of Novichok in Salisbury may have had two separate containers of the nerve agent.
The paper says there are fears that while one was picked up by Dawn Sturgess and Charlie Rowley, a separate one may still be lying somewhere undetected.
The continuing row within the Labour party over anti-Semitism is the main story for the Mail on Sunday.
It says there is evidence of a carefully co-ordinated campaign by supporters of Jeremy Corbyn to punish those who dare to challenge anti-Jewish prejudice in the party.
And there is now a mounting backlash against the leader for the way he has handled the issue.
In an editorial, the paper says Mr Corbyn, having survived repeated moderate rebellions, may have finally picked a fight he cannot win.
A triumphant Geraint Thomas is pictured on many of the front pages after the Welsh cyclist completed the penultimate stage of the Tour De France - making victory almost certain in Paris on Sunday.
Tour convention dictates that the race leader is never challenged on the final stage, so Thomas only needs to reach the finish to win.
"From prince of Wales to the king of France" is how the Sunday Telegraph headlines the story.
It says that in the Cardiff suburb of Birchgrove, Thomas is remembered as a man who has not forgotten his roots. So much so, that midway through the tour, he took time to send a video message to the sick daughter of his old coach, telling her to "keep fighting".