Peter de Putron
Peter de Putron is a banker who lives in Guernsey and is the brother-in-law of the former UK financial services minister and now energy minister Andrea Leadsom. He is the founder of De Putron Fund Management.
Donations were made to his sister-in-law Andrea Leadsom directly through UK-registered companies controlled by de Putron: Gloucester Research, which changed its name to GR Software & Research, then to Trenchant, and now trades under yet another name, G-Research. Leadsom's husband, Ben Leadsom, is a director.
Before being elected Conservative MP for South Northamptonshire in 2010, Leadsom was Managing Director of De Putron Fund Management between 1997 and 1999. Using data gathered by the Washington-based organisation the International Consortium of Investigative Journalists, a July 2014 report by The Guardian found that her brother-in-law Peter de Putron had donated £816,000 to the Conservative Party since 2010. 
Dining with ministers
A seating plan of the Conservative Party's Black and White Ball, in February 2014, was leaked to the Bureau of Investigative Journalism in October 2014. The party, which guests pay between £450 and £1000 for a ticket, seats diners with the minister most relevant to them. It revealed that de Putron was sat at a table with Jeremy Hunt MP, the Secretary of State for Health and and Jersey’s Treasury minister, Philip Ouzouf. 
- David Leigh, James Ball and Leila Haddou, Top Tory has family link with offshore banker who gave party £800,000, The Guardian, 8 July 2014, acc 16 July 2014
- ‘LEADSOM, Andrea Jacqueline’, Who's Who 2014, A & C Black, an imprint of Bloomsbury Publishing plc, 2014; online edn., Oxford University Press 2013, accessed 9 July 2014.
- Melanie Newman, Nick Mathiason and Tom Warren Doorstep lender and property moguls amongst guests worth £22bn at Tory fundraiser Bureau of Investigative Journalism, 12 October 2014, accessed 14 October 2014