Burnham recently suggested £500k political donation cap that would be ‘reduced over time’

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”.