Found this article about CircusFest in April. I assume it'll be a similar show they take to Glasto in June.
Quote:
EDGY acts a far cry from traditional clowns and jugglers will perform at the Roundhouse in Chalk Farm in April as part of CircusFest.
As a former train turntable shed, the Roundhouse looks uncannily like a circus big top. Among the highlights will be Trash City, a sensation at last year’s Glastonbury Festival, so I’m told. Apparently their new show is a bit racy. It will reportedly be for over 18s only.