A senior aide to Rishi Sunak has admitted he is being investigated by the Gambling Commission after reportedly placing a bet on the date of the general election.

Tory candidate Craig Williams, who was the prime minister’s Principal Private Secretary in the last Parliament, said he would cooperate with the probe.

In a statement on X, formerly known as Twitter, he said: “I’ve been contacted by a journalist about Gambling Commission inquiries into one of my accounts and thought it best to be totally transparent.

“I put a flutter on the general election some weeks ago. This has resulted in some routine inquiries and I confirm I will fully cooperate with these.

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