Arctic temperatures that plummeted to below -50F and exhaustion that led to hallucinations failed to stop a Cheam father-of-two completing the 300-mile Yukon Arctic Ultra Challenge.

Ryan Shaw, 42, of Roseberry Road, Sutton, spent more than a week trekking across 300 miles of Canadian Arctic terrain in aid of Brain Tumour Research.

He was one of just three competitors in his category to complete the challenge, raising nearly £5,000.

He finished the race on February 19.

Mr Shaw said: “It was amazing. What an experience. I think my legs are just about recovering.

“Towards the end you are suffering from sleep deprivation and from not eating or drinking enough.

“And from the effort of having to run through the night.

“Canada gave an extreme weather warning. It was down to -50F and for the first 200 miles there was no shelter other than what you took with you."

Donations can still be made at justgiving.com/yau2015.

“The hardest stretch of the entire 300-mile race was the final day.

“The first 30 miles of the last 60 miles were the worst. It was 2am, dark.

“I just wanted to go to sleep.

“You stop for some rest, you are standing there and then you start dreaming. You wake up, you start talking to people who are not there.”

His wife Maria, and their children, Luca, 10, and Solana, seven, were able to follow his progress via a GPS tracking device.

Mr Shaw chose to support Brain Tumour Research after the wife of a colleague and a family friend both died after diagnoses of brain tumours.

Sue Farrington Smith, chief executive of Brain Tumour Research, said: “We are tremendously grateful to Ryan and others like him who undertake such impressive challenges.”