Front-runner to become the next PM, Andy Burnham, and the record-breaking heatwave across the UK and Europe are prominent across Saturday's papers. Burnham is being urged by former Cabinet Secretary Lord Case to "be honest" with the public and call an early election, the Daily Telegraph reports. In an interview with the paper, Lord Case warns Burnham is "walking a very difficult tightrope" by promising change but having no mandate to deliver it.