As a snapshot of pure sporting excellence, Josh Kerr’s world title over 1500 metres fulfilled every requirement. With an impeccably-timed charge around the final bend in Budapest, he vanquished a truly global field in an event that, from Sebastian Coe to Steve Ovett, Steve Cram to Jake Wightman, has never failed to capture the nation’s imagination. His family celebrated deliriously in the stands as he held off Jakob Ingebrigsten through sheer force of will, and they were not alone.