The former fiancée of Scot Young, the late British tycoon who had murky business links to Russia, claims she is being threatened by the poisoners who had targeted the double agent Sergei Skripal in Salisbury.

Noelle Reno, 34, was in a relationship with the businessman shortly before he was found impaled on railings below his £2m flat in Marylebone, central London, in 2014.

Reno fled Britain two months ago after receiving a message from an anonymous email account in Switzerland asking her for £50,000 with the warning: “The devil has come for his dues.”

In an interview with The Sunday Times Magazine, Reno said: “It was a week after the [Skripal] poisoning and whoever had written the email was claiming the assassination attempt as their