Er mwyn bod yn dryloyw, cafodd y protocol ei ddosbarthu gan yr Ysgrifennydd Parhaol i holl Aelodau'r Cynulliad ym mis Ionawr. Yn unol â'i gylch gwaith fel cadeirydd yr ymchwiliad, aeth Mr Bowen CF ati i drafod cylch gorchwyl arfaethedig ei ymchwiliad â'r teulu Sargeant. Drwy Mr Bowen, gofynnodd y teulu am gael gwneud diwygiad i'r telerau er mwyn egluro cwmpas yr ymchwiliad, a chytunodd yr Ysgrifennydd Parhaol â hynny.
In the interests of transparency, the protocol was circulated by the Permanent Secretary to all Assembly Members in January. In line with his remit as chair of the investigation, Mr Bowen QC discussed proposed terms of reference for his investigation with the Sargeant family. An amendment to the terms to clarify the scope of the investigation was requested by the family through Mr Bowen and agreed by the Permanent Secretary.