abdul hadi arwani was found dead in wembley on wednesday morning .
the 48-year-old imam had been replaced at the an-noor mosque in acton .
his replacement was 53-year-old hassan anyabwile from the caribbean .
anyabwile involved in attempted coup in 1990 , parliamentary report found .
belonged to a local radical islamic group called jamaat al muslimeen .
he moved to the uk after being given amnesty in exchange for surrender .
he denied any dispute between the west london mosque and mr arwani .
the mosque has refused to answer questions over mr arwani 's time there .
counter terrorism police are now leading the investigation into his death .