Ed is tutored by Barney Greenway of Napalm Death in the fine art of extreme metal vocals.

Glastonbury will open its first ever punk and metal stage this year so what better time for Ed Miliband to learn the fine art of extreme metal vocals.

Under the tutelage of Barney Greenway, lead singer of the death metal group Napalm Death, he gives it his very best 'throaty' metal roar.