One of the world's leading institutes for researching the impact of global warming has repeatedly claimed credit for work done by rivals – and used it to win millions from the taxpayer.

An investigation by The Mail on Sunday also reveals that when the Centre for Climate Change Economics and Policy (CCCEP) made a bid for more Government funds, it claimed it was responsible for work that was published before the organisation even existed. Last night, our evidence was described by one leading professor whose work was misrepresented as 'a clear case of fraud – using deception for financial gain'. The chairman of the CCCEP since 2008 has been Nick Stern, a renowned global advocate for drastic action to combat climate change.

He is also the president of the British Academy, an invitation-only society reserved for the academic elite. It disburses grants worth millions to researchers – and to Lord Stern's own organisation.