As festival-goers packed up their tents and left Glastonbury Festival for another two years, they left behind a site strewn with rubbish and the detritus of an epic long weekend of music and mayhem. But the industry returned to its desk on Monday (or, more likely, Tuesday) to see a much prettier picture.

For a start, there were huge TV viewing figures, with the BBC coverage reaching a record 20.9 million people, up 12% on 2016.

Ed Sheeran set a ...