The largest single donation to Yvette Cooper's Labour leadership campaign comes from a former donor to the Conservative party.

Businessman Peter Hearn gave Cooper £75,000 to support her campaign for the Labour leadership. According to the latest listing Cooper made in the register of MPs' interests, Hearn's donation makes up over a quarter of the £260,000 she has raised to fund the "Yvette for Labour Leader" campaign.

However, figures given to the Electoral Commission show that Hearn also gave £10,000 to the Conservative party in the run-up to the 2010 election.

Hearn is a multi-millionaire accountant behind PSD Group, an executive recruitment firm specialising in high-level jobs in banking, finance, and other sectors. His donation was registered this month, although the actual donation was made in July.