The organisers of Glastonbury Festival have released a statement in which they discourage the use of nitrous oxide in the King's Meadow area of the site, which is where the stone circle is found.

The issue was addressed in this note, published by the coordinator of Glastonbury's Green Fields, Liz Eliot.

"Sadly the King's Meadow has lost its way," it reads. "It's become known as a place where people take nitrous oxide, a damaging drug which pollutes our beautiful field with noise, litter and N2O gas (a greenhouse gas which is 298 times more polluting than carbon dioxide). Nitrous oxide is also dangerous: an exploding canister was the source of a major injury at last year's Glastonbury... the arrival of so much nitrous oxide in the King's Meadow - some two tonnes of canisters were picked up, by hand, at Glastonbury 2014 - has darkened the field's atmosphere. Now, though, is the time to reclaim the spirit and lighten up the energies. Nitrous oxide will not be welcome in the King's Meadow at Glastonbury 2015, and we will be asking people not to use it."

Glastonbury Festival takes place between June 24th-28th: it is sold-out.