As I strode through the full body airport-style metal-detector check into Wembley Stadium for Taylor Swift’s Eras Tour return, my mind floated back to my first concert at Knebworth Park in 1986. I’m sure Hertfordshire Constabulary must have been in attendance but security, from memory, primarily consisted of fearsome-looking Hell’s Angels tasked with preventing fans smuggling in booze.

Four decades on and the fear of somebody getting wasted on Special Brew has been replaced by the…