Daisy Goodwin, who created royal period drama "Victoria," says a government official groped her breast while she was visiting Downing St to discuss a proposed television program.
She says she did not report the incident, which happened during the 2010-2016 administration of Conservative Prime Minister David Cameron.
Goodwin told Radio Times magazine that recent abuse revelations made her reconsider her silence.
Cameron's spokesman said he was "alarmed, shocked and concerned" and had informed the Cabinet Office, which investigates allegations of misbehavior in politics.
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