When Jim Moston decided to volunteer as a litter picker at Glastonbury in 2016, he wasn’t expecting more than a fun weekend. “You get free food and showers and it’s a great way to see the festival,” he says. On Sunday afternoon, he and some friends let off steam with a drinking session. “We’d bought a box of wine and found an old backpack, so we strapped it to my friend’s front like a pair of udders,” he says, laughing.