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The party was also criticised by the Information Commissioner for a mailshot in December 2019 after concerns had been raised.

Some supporters got a typical mailshot, an emotional story about an individual beneficiary called Sebastiana.

The mailshot, seeking their backing for the proposals agreed at Chequers last month, also features positive messages from ministers and other big hitters in the party endorsing the package.

The campaigns were allowed to spend up to £7m, get a free mailshot, TV broadcasts and £600,000 public funds.

He said: "Our first ever election broadcast aired nationally on Thursday evening and was very well received. "We are preparing a mailshot of over one million leaflets to be delivered to homes across the country.