Newspaper headlines: 'Queen won't stand down' and 'lost' British boy
The Barcelona attack continues to dominate the papers.
"We pay homage to Catalonia," says the Sunday Times.
The Mail on Sunday tells those who mourn the dead in Barcelona: "We share your grief."
The Observer says the sentiments and rituals in the aftermath of another outrage have taken on "an air of terrible familiarity".
A photograph in the Daily Star Sunday shows the practical impact on life in the UK of terror attacks such as the one in Barcelona.
Concrete blocks have been positioned around the popular shopping centre at Bicester Village in Oxfordshire.
The paper says the SAS has been put on stand-by in case of an attack during the bank holiday weekend.
The Sunday Telegraph reports on the proposed introduction of new checks to make it harder for extremists to hire rental vans.
But Peter Hitchens, writing in the Mail on Sunday, says "we cannot ban cars or vans" or "put obstacles on every major street".
He worries that the reporting of these attacks results in more of them happening, when, in his view, the perpetrators are often "petty criminal losers with a long history of violence and long-standing drug habits".
However, Stephen Pollard argues in the Telegraph that "there is a cancer in parts of the Islamic world, which must include swathes of Britain".
Brexit is, as ever, under discussion. The Sun on Sunday believes good times are just around the corner.
It suggests households will be better off when the UK leaves the EU - prices will tumble and output will rise. For that view the paper relies on a report by economists, including professor Patrick Minford.
As the negotiations progress, the Observer believes there's been a slowly-dawning sense that "too hard" a withdrawal could pose dangers for business.
The paper asks how much longer London will remain the pre-eminent hub for the development of new technology ventures in Europe?
And its political editor says legal experts wonder how Britain could break away from using the European Court of Justice to settle business disputes, while staying closely liked to the EU in trade and customs arrangements.
Writing in the Sunday Times, the Brexit secretary David Davis believes the conflict can be overcome.
He wants the EU to discuss its future trading arrangements with us at the same time as other issues and is confident that new mechanisms to manage disputes can be put in place.
With the 20th anniversary of the death of Princess Diana approaching, The Mail remembers her in a 16-page supplement.
Others also give prominence to items about her and the royal family. The Sun prints transcript of a late night phone call between the princess and George Michael.
The Times gives most of its front page to a report that the Queen has "no intention of stepping aside" so that Prince Charles can take over during her lifetime.
According to the Sunday Express, Prince Harry has been collecting his girlfriend from the tarmac of Heathrow - so she can bypass the queues at passport control.
"A well-placed source" tells the paper "it's been happening for a while".
From the autumn, says the Sunday Express, patients will be able to consult their family doctors over the internet.
Trials have been carried out and the scheme will now be adopted across England, despite the concerns of some GPs that it is motivated by a desire to cut costs.
The paper says its supporters think the change will allow doctors to give more time to cases that need it.