Nick set up SolarAid in 2006 with £35,000 from Solarcentury, the UK's largest solar company. Since then, he has raised $10m and grown SolarAid into an award-winning social enterprise with 35 people in six countries working on ground-breaking new solar projects for development.

Borge and Fiona of Prospectus, a leading recruitment agency, will be leading the search for Nick's successor. Their email addresses are Fiona.wansborough at prospect-us.co.uk and borge.andreassen at prospect-us.co.uk. Please do contact them if you know of any potential candidates.

Nick said: 'We are looking for world-class individuals with outstanding skills in leadership, international management, scaling up operations in Africa and a proven track record of success. The best candidate will join an organisation with a superb board of trustees and a highly professional and dedicated team of staff and volunteers that are well regarded in the NGO and social enterprise community.'

Nick will continue on a part-time basis providing support for fundraising and development. However, the majority of his time will be spent building an international medical research consortium to find a cure for Alkaptonuria, the first genetic disease ever discovered (in 1901 in London): www.alkaptonuria.info.

Nick said: 'I've thoroughly enjoyed my time at SolarAid. Seeing it grow from a small NGO based in my spare bedroom to an international organisation has been a real adventure. I now need to focus on finding a cure for my two boys.'

To find out more about SolarAid, go to: www.solar-aid.org.