London is already baking in the opening days of the country’s latest heatwave as 45,000 fans descend upon Finsbury Park for one of the biggest rock bills of the summer. Under cloudless blue skies, Wavves, Marmozets, Don Broco and Nothing But Thieves steadily raise the temperature before Biffy Clyro deliver the kind of career-spanning headline performance that reminds everyone exactly why they remain one of Britain’s greatest live bands.