Burnham accused of U-turn after initially backing political donations cap to fall below £500k

Exclusive: Campaigners accuse prime minister of U-turn after he decided not to back funding cap in elections bill

Andy Burnham recently supported an even lower donations cap than previously reported, according to correspondence seen by the Guardian, as the row over next week’s elections bill escalates.

The prime minister wrote to a campaigner in May outlining his support for a £500,000 individual donations cap, which he said would “guard against the perception of any one party being unduly influenced or swayed by one person or organisation”.

In a follow-up email seen by the Guardian, Burnham went on to say he believed the cap should gradually be reduced – a proposal now being put forward by the Labour MP Stella Creasy .

Campaigners are accusing Burnham of a U-turn after the Guardian reported the prime minister had decided not to back the attempts by Creasy and others to introduce a donations cap in next week’s elections bill.

In his first message to Shaun Bowler, who runs the website wakeupgb.co.uk , Burnham wrote: “I do think there should be a cap on political donations. This would guard against the perception of any one party being unduly influenced or swayed by one person or organisation.

“As to the level, I think that would have to be subject to wider review of political funding but my gut feeling would suggest somewhere in the region of £500k.”

Then in a second message, the then would-be MP for Makerfield said: “[I] would definitely want to see that reduced over time. I am in complete agreement that there needs to be wholesale culture change in Westminster.”

Bowler has now written to the prime minister accusing him of abandoning his previous commitments.

He wrote: “It appears you are going to break your promise to me – and the nation …. Weeks after being elected, you have made your first major U-turn.”

He added: “This is your chance to actually deliver the start of that cleanup. Show us that politics can be clean and trustworthy. Don’t surrender to the mess.”

Other campaigners, including the broadcaster Carol Vorderman, are also urging the prime minister not to back down in the face of opposition from trade unions, who have warned that a donations cap could undermine their ability to contribute to the Labour party.

Senior figures at groups including Transparency International, Spotlight on Corruption and Greenpeace, have also written to Burnham.

In their open letter they call for a “low and hard cap on all political donations”, adding: “We know you agree that politics should not be for sale. Please take action now to ensure it will not be under your leadership.”