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The man was seen on his amble in the area around the British Museum on Sunday 24 January.
Police were called but couldn't find the man because, by that point, he had apparently run away.
A slightly bemused witness explained what she saw though.
Catherine, 22, said: "I was out for my daily walk going down Great Russell Street, just off Tottenham Court Road, around 3.45pm when I turned around and noticed a stark naked man walking down the road.
"He was walking quickly towards Bloomsbury Square Gardens and past the British museum completely unphased by the numerous people staring at him.
"Once he got to the gardens he turned round and started walking back on himself."
Another passerby confronted the unexpected nakedness. Catherine continued: "One man stopped him and asked why he was naked to which he casually replied 'I just took my clothes off to wash myself' and carried on walking.
"My friend called the police who said the museum security had already called it in, then asked for a description of the man 'aside from the naked part'.
"Once he walked past the museum he started running and we lost him.
"A few minutes later a police car and an ambulance were patrolling the area. A bit more exciting than our usual Sunday walk!"
A Metropolitan Police spokesperson said: "Police were called at 3:53pm on Sunday, January 24 to reports of a man seen walking naked in Great Russell Street.
"Officers attended and carried out a thorough search of the area. Nobody matching the description was found."
Maybe the naked fella is taking some pointers from Juliette Gill and her husband Ivan who have been encouraging people to spend more time during lockdown in their birthday suit.
The pair, who live in Scotland, have spent 15 years as naturists and say they're happy to do most things while naked including gardening, chilling in their hot tub and even cooking - sounds a bit dangerous.
They hope more people will enjoy the freedom of naturism and are the faces (and bodies) of a new campaign from British Naturism, the cleverly named Great British Take-Off.
Juliette told the Daily Record: "If you've got a garden, enjoy it. Sunbathe, garden, play games, it's all much more fun when you're naked."
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