An estimated 60,000 people – including Hollywood A-listers – are taking part in a charity sleep-out as a fundraiser to end homelessness went global. Organisers of the World’s Big Sleep Out, which began on a small scale in Edinburgh in 2016, said 52 cities are participating in this year’s event, from Brisbane to Los Angeles. Fundraisers in London’s Trafalgar Square are being treated to a bedtime story by Dame Helen Mirren, while Will Smith will do the honours in New York’s Times Square.