Detectives searching for a missing oil executive have released CCTV images of a man they want to speak to in connection with the investigation.
Carole Waugh, 50, has not been seen by her family since mid-April and concerns are growing after a fraudster tried to sell her flat in central London by posing as her brother, Chris.
Financial activity linked to her identity has also grown "incrementally more suspicious" since she vanished, Detective Chief Inspector John McFarlane said. Scotland Yard released the images of a man outside a branch of Sainsbury's in Crown Road, Enfield, north London, on July 10, where one of Miss Waugh's bank cards was used.
Police are appealing for anyone who has known Miss Waugh since she moved to London in 2008 to come forward. She is originally from Durham, and since her mid-20s had spent time living in Libya and London.
On Wednesday, Mr McFarlane said "very substantial sums of money" have been stolen since the businesswoman was last seen by relatives at a family party at Easter. At least three women have tried to impersonate her - one at the Westfield shopping centre in west London on July 13. A man has also posed as her brother, Chris, at her flat in Marylebone, central London, in an attempt to sell it.
Miss Waugh's 53-year-old brother, who lives in Cumbria, said it was "a very distressing moment" to discover the conman had posed as him. He said the family were "euphoric" at the Easter party, and were planning a birthday party for Miss Waugh, who turned 50 in June.
As well as a family celebration, she was planning a holiday to Las Vegas with female friends, and Mr Waugh appealed for them to come forward, as well as anyone who may have worked with her recently. Mr Waugh said: "We are keen to track them down to see what was going on. If we could find the friends, just to see what light they can shine on sister. Anything with regards to friends or work colleagues even."
Miss Waugh was able to work sporadically because she had been "very careful" with her money, her brother said. He called on anyone who has information to come forward.
Miss Waugh, described by police as "a successful businesswoman", worked for Veba Oil in Libya for a number of years. She was "very frugal and careful" and bought property in Harrowby Street, Marylebone, where she was living when she went missing. She last contacted her mother about a week after leaving Cumbria on Easter Monday and since then nothing has been heard from her.
Miss Waugh would always contact relatives, even while she was living in Tripoli, her brother said. "Even when she was in Libya you would get a weekly or a fortnightly phone call to reassure everybody that everything was all right."