The move comes after the Sunday Times published details of secret recordings in which former Tory co-treasurer Peter Cruddas told undercover reporters that they could secure private meetings with ministers – potentially to influence policy formation – if they donated more than £250,000 to the Conservative Party.

Cruddas resigned on Saturday in light of the report.

The Prime Minister has now pledged to publish a quarterly register of future meals at official residences with people who have donated more than £50,000 to the Tories.

He also called Cruddas’s comments “completely unacceptable” and insisted there would be an internal party inquiry into funding.

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