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.

ContributorsHolly Williams - Business Editor, Press Association news agencyHermann Hauser - Entrepreneur, venture capitalist and co-founder of Amadeus Capital PartnersHarriet Green - Investor, philanthropist. Former chair and CEO of IBM Asia PacificPete Thornhill - School friendVictoria Drew - School friendDavid Cleevely - Entrepreneur and former Raspberry Pi chairman

Production teamProducers: Julie Ball, Farhana Haider, Ben Morris, Michaela GraichenEditor: Tom BigwoodSound: Gareth JonesProduction Co-ordinator: Maria Ogundele

ArchiveCentre for Computing History, CambridgeKerbal Space Program: Take-Two Interactive, publisher Private Division, developer SquadSensible Soccer: developer Sensible Software