Margaret and Robin knew of Laniet's prostitution

Margaret and Robin knew of Laniet’s activities in prostitution. A letter from Margaret to Laniet was found among her belongings at Taieri.  There is no basis for the scenario that Laniet was going to come home and "tell all" as proposed by the Bain defence.  They already knew.  Although this letter was given to Peter Robinson a couple of weeks after David’s arrest it was never used in evidence.