An amusing video has emerged from the UK of a uniformed police officer moshing to a heavy metal band at a rock festival.

The footage, captured at the Six Fields Rock Festival on July 9, shows the policeman rocking out to a Slipknot cover band.

The officer can be seen striking his police baton on a metal cylinder held up by the band's drummer.

He can also be seen passionately singing along to the chorus of Slipknot's song 'duality'.

Speaking to a local news organisation after the concert, a fellow officer wrote:

“The crowd loved it. It just showed that human side to us, rather than us standing there with our arms crossed. I think it’s nice for them to see that we are there to enjoy it and to look after them.”

Sargeant Martin Waller is a massive slipknot fan, so he just couldn't resist getting involved when Clown jumps off the stage with his metal leg and baseball bat! What ensues is pure mental - and metal as he uses his baton to beat the keg while moshing along with the band!

Bonus fail footage of one overzealous drummer taking a whack to the head with the baseball bat as it bounces back off the keg!