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David Cameron was "alarmed, shocked and concerned" to hear allegations of a sexual assault at 10 Downing Street during his time in office, the former prime minister's spokesman has said.

TV producer Daisy Goodwin has claimed she was groped on her breast by a Government official during a visit to Number 10 to discuss a proposed television programme.

Conservative former minister Anna Soubry said that the incident sounded like a sexual assault which could lead to a criminal charge if Ms Goodwin chose to report it to police.

And Downing Street has said that the Cabinet Office would look into any formal complaint that was made.

Ms Goodwin, the creator of hit ITV series Victoria, said that she did not report the incident at the time, but was no longer sure whether she was right to keep quiet.

She told the Radio Times that the official, who was a few years younger than her, surprised her by putting his feet onto her seat as they sat in an office at Downing Street and told her her sunglasses made her "look like a Bond girl".

"At the end of the meeting we both stood up and the official, to my astonishment, put his hand on my breast," she said.

"I looked at the hand and then in my best Lady Bracknell voice said: 'Are you actually touching my breast?' He dropped his hand and laughed nervously."

She said: "I wasn't traumatised, I was cross, but by the next day it had become an anecdote, The Day I Was Groped In Number 10.

"Now, in the light of all the really shocking stories that have come out about abusive behaviour by men in power from Hollywood to Westminster, I wonder if my Keep Calm and Carry on philosophy, inherited from my parents, was correct? The answer is, I am not sure.

"I think humiliating the official was probably the appropriate punishment, but suppose he tried it on with someone less able to defend themselves?"

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Responding to reports of Ms Goodwin's allegations, a spokesman for Mr Cameron said: "David Cameron was first made aware of this serious allegation yesterday. He was alarmed, shocked and concerned to learn of it and immediately informed the Cabinet Office.

"As is usual practice, the Cabinet Office will thoroughly investigate any complaint made."

Ms Soubry told BBC Breakfast that the alleged incident sounded like sexual assault.

"It's appalling. That's a criminal offence. Sounds to me like sexual assault. In that event, if she wants to, she should report it to the police.

"If she wants to, she should certainly report it to Number 10.

"For a lot of women, it doesn't matter who you are, it doesn't matter how much bravado people think you have, this sort of assault - and it is an assault - is often deeply traumatic and we need to wake up to what it really is. And we need to take action when it is required.

"We have got to change the culture as well. And men should keep their hands to themselves."

Theresa May's official spokesman said: "Of course this is something that we would be concerned about. We are looking at it, and as we have said, wherever an allegation has been made we will make sure it's treated with the utmost seriousness."

Ms Goodwin's story is the latest in a series of allegations of unwanted sexual advances at Westminster, with First Secretary of State Damian Green and international trade minister Mark Garnier facing inquiries over claims of inappropriate conduct.