It’s a tiny computer with a catchy name: Raspberry Pi. But what's the story behind the man who thought up this affordable device?

His name is Eben Upton. He has gone from being a child desperate to make computer games, to the head of a company described as a ‘city darling’.

The firm reported higher than expected profits in its first report, after being listed on the London Stock Exchange.

Stephen Smith has been speaking to Eben Upton’s childhood friends, former colleagues and some big hitters in tech and business.

Contributors Holly Williams - Business Editor, Press Association news agency Hermann Hauser - Entrepreneur, venture capitalist and co-founder of Amadeus Capital Partners Harriet Green - Investor, philanthropist. Former chair and CEO of IBM Asia Pacific Pete Thornhill - School friend Victoria Drew - School friend David Cleevely - Entrepreneur and former Raspberry Pi chairman

Production team Producers: Julie Ball, Farhana Haider, Ben Morris, Michaela Graichen Editor: Tom Bigwood Sound: Gareth Jones Production Co-ordinator: Maria Ogundele

Archive Centre for Computing History, Cambridge Kerbal Space Program: Take-Two Interactive, publisher Private Division, developer Squad Sensible Soccer: developer Sensible Software