Harry and Luke Treadaway discuss the difficulty of playing conjoined twins on and off camera.

Brothers of the Head is the feverish, mind-bending odyssey of conjoined twins Tom and Barry Howe who were plucked from obscurity by a 1970s music promoter and groomed into a boy band.

Grappling with impossible love, artistic rivalry and a dark inner life, the twins embrace their freakishness and spit it back in the form of searing Punk Rock.

Brothers of the Head is a raucous ride through the seamy underground of '70s rock and an unsettling glimpse into a relationship that is as beautiful as it is destructive.