If Julie had rang Nevill, he had several choices. He would know the best one.
Think he would have just believed she had had a domestic with Bamber, and was trying to cause trouble. No doubt Nevills first port of call would be to ring Bamber, and he would just deny it and say what I have just said.
Nevill would side with his son ( and possibly be glad that Bamber was intending to leave Julie ( as Bamber would probably say )as he knew June would be )
Nevill was too busy and too overworked. I don't think he would have taken it seriously.