Two endurance athletes have finished a race for climate justice that would have impressed athletes competing in this year's Olympics.

Moses Tutesigensi, 22, and Catherine Garsed, 24, ended their 661-mile challenge at 10 Downing Street on Wednesday, 16 days after setting off from Edinburgh.

Ultra-marathon runner Tutesigensi ran the distance, while Garsed cycled.

The pair have raised £3,000 for Christian Aid, where they were both interns.

They travelled between 13 and 66 miles a day, carrying all their food, water and clothes.

Stops along the way included Middlesbrough, Manchester, Birmingham and Bristol.

The epic journey ended with them handing in a climate justice petition to the Prime Minister's official residence.

Over 1,000 signatures were collected along their route for Christian Aid's Climate Justice Campaign.

The petition asks David Cameron to work towards ensuring access to sustainable energy for all in the run up to the G20 conference in June.

Christian Aid is calling on G20 countries to do more to support developing countries in replacing fossil fuels with renewable sources of energy, such as solar power.

Garsed said: "We are calling on the Prime Minister to use his power to support access to sustainable energy for all at the G20 meeting of world leaders this June.

"In a world where 1.4 billion people have no access to electricity we challenge him to speak up for the poorest and work for change."

Moses added: "This is an issue that affects the world’s poorest. If global temperatures rise by 2%, experts predict acute water shortages for one to three billion people, rising sea levels that could flood 18% Bangladesh, and 30 million people going hungry as agricultural yields fail globally."