A television producer said he was touched by a public official during a visit to number 10 Downing Street.
Daisy Goodwin, who created the ITV series Victoria, told the Radio Times, the man put his hand on her breast, after a meeting to discuss a proposal for a TV show, when David Cameron was the PM.
Ms Goodwin said she was “cross”, but did not report the incident.
Downing Street said he took the allegations seriously and officials in a formal complaint, it should be done.
Ms Goodwin said the officer – who has not been named – he invited her in an office at Number 10 for the meeting during Mr Cameron’s time in office between 2010 and 2016.
He said that the man says that his sunglasses made me look like a Bond Girl”.
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“At the end of the meeting, they both stood up and official, to my amazement, put his hand on my breast,” she told the magazine.
“I looked at the hand and then my best Lady Bracknell voice said: `I’m actually touching my breast?’
“He dropped his hand and laughed nervously.”
Ms Goodwin said she left Downing Street, in a state of “high dudgeon”.
“I wasn’t traumatized, I was cross. But the day after he had become an anecdote, The Day I Was groped In Number 10,” he said.
However, he said the revelations of alleged abuse at Westminster, and Hollywood had made her question whether she was wrong not to make a formal complaint.
Hollywood has been shaken by the accusations against movie mogul Harvey Weinstein and others.
In Westminster, the more Conservative and Labour MPs are being investigated for the causes of sexual misconduct.
Ms Goodwin said: “Now, in the light of all the really shocking stories about the behavior of abusive men of power from Hollywood to Westminster, I wonder if my Keep Calm and Carry on philosophy, inherited from my parents, is that correct?
“The answer is, I’m not sure.”
A spokesman for Downing Street said: “Allegations like this are taken very seriously.
“The Cabinet Office, in any formal complaint, it should be done.”