The Met Police has referred itself to the Independent Police Complaints Commission over its handling of the inquiry into missing Sian Blake. Murder detectives are continuing their search for the boyfriend of the former Eastenders actress after three bodies were discovered in a garden in southeast London. The 43-year-old actress, who played Frankie Pierre in Eastenders, vanished with her sons Zachary, eight, and Amon, four, on 13 December. They were last seen in Waltham Forest, east London, and Ms Blake's silver-beige Renault Scenic, was found in Calvert Avenue, Bethnal Green, east London. Zachary (L) and Amon Scotland Yard launched a murder investigation on Tuesday after the bodies were found at the family home in Erith. Last night, it emerged that Miss Blake's partner and the children's father, Arthur Simpson-Kent was interviewed by police at the family home on 16 December. He has since disappeared and is thought to have fled to Africa, according to The Sun. A Met Police spokesman said: "The Metropolitan Police has today, Wednesday 6 January, made a voluntary referral to the Independent Police Complaints Commission in relation to the Sian Blake missing person investigation. "An initial review has highlighted some potential issues regarding the handling and grading of the missing persons investigation. "The Directorate of Professional Standards was informed on Monday, 4 January and is working with the investigation team to fully understand the timeline of police interaction with the family." The bodies have not yet been formally identified but Ms Blake's family has been informed of the discovery. Detectives continued to appeal for information about the location of Mr Simpson-Kent. He is described as a light-skinned black man who is 6ft 2in tall. Miss Blake had motor neurone disease - a fatal, rapidly progressing disease that affects the brain and spinal cord - and was reportedly looking "very frail" before she vanished