Radio DJ Emma B says Wayne Couzens flashed her in Greenwich

Emma Wilson, who has opted to waive her right to anonymity, told BBC Radio 4's Woman's Hour that a man exposed himself to her when she walked past an alleyway in south east London, and recently recognised his photos in the news as a "face that stays with you" forever.

The Magic FM DJ, known as Emma B, said Met officers laughed at her when she reported the incident, and she described the ordeal as "humiliating".

Wayne Couzens, 48, was handed a whole life order for the “grotesque” killing of the Sarah Everard which shocked and outraged the nation.

Former Met Police officer Wayne Couzens will spend the rest of his life behind bars - PA

The Met Police officer falsely arrested the 33-year-old marketing executive living in Brixton for breaking lockdown rules before kidnapping, raping and murdering her.

The Metropolitan Police say they are investigating the claims that Ms Wilson was flashed by Couzens in Greenwich 13 years prior.

• Everard murderer 'slapped female officer's bottom' while working in Bromley

Ms Wilson told the radio show how she ran into a nearby shop to alert police who then visited her to take a statement.

Wayne Couzens in court - PA

"They were asking me what I could see... he was playing with himself and there were specifics about his state of arousal that they thought were quite amusing. It was really humiliating," Ms Wilson said.

"I remember clearly saying to them, 'I really hope this is all he needs to do' and I said that at the time because I was so struck by how feeble their response was."

She said she was "so very sure" it was Couzens who exposed himself to her - at the time he was a volunteer officer with Kent Police - as he has a "face that doesn't go anywhere, it stays with you".

The presenter said the incident was "aggressive, it was purposeful, it was calculated" and that "it wasn't this comic character that we have of this local peeping Tom or the local flasher in the flasher mac".

Sarah Everard, 33-year-old from Brixton, tragically killed earlier this year.

"There's a really big part of me that hopes it wasn't him because if it was this is horrific that it could have gone on for so very, very long."

The Met Police said that at the time they conducted a search of the area but the suspect could not be found, whilst CCTV inquiries were also not successful and the matter was passed on to local safer neighbourhood teams

"In terms of it being Wayne Couzens, to the best of our knowledge we are not aware of any reports prior to his March arrest when he was named as a suspect. If we receive any allegations we will access and investigate accordingly," the force said.

Police watchdog the IOPC is currently looking into the Met's handling of three other alleged indecent exposure incidents involving Couzens, including one said to have taken place in south London three days before he murdered Ms Everard.