This trio of barbers usually do not have a hair out of place.

But Elliot and Olly Branford are teaming up with their boss Cameron McKenzie to take on the ultimate muddy challenge.

The Tough Mudder is a 10-12 mile mud and obstacle course designed to test physical strength, stamina and mental grit.

'It was one of those spare-of-the-moment things and we thought if we are going to do it we should also support a local charity,' said Mr McKenzie, 46, who has owned McKenzie's Traditional Barbers in King's Lynn for four years.

On September 25 in South London, the men will face the start line of their challenge in aid of Scotty's Little Soldiers.

The charity, based in Lynn, supports children who have lost a parent while serving in the armed forces.

The barbers initially aimed to raise between £200 and £300 combined, but have already hit the £500 mark and are calling for people to donate to increase their total even more.

Mr McKenzie, who has practiced martial arts for 30 years, might be more prepared than most to take of the test of strength.

But Elliot, 26, said: 'I used to play roller hockey but stopped three years ago. Then, I saw myself growing slightly so this has given me something to work towards.'

His brother Olly, who served in the Royal Navy for four years, added he was used to facing obstacle course challenges.

To sponsor the barbers visit their shop on 127 Norfolk Street.