Excuse me,Adam. " Taff " Jones was a highly respected man in his field,who'd received 10 commendations throughout his 30 year service with the Essex force. He wasn't just some two-bit cop.
NOBODY knows what confronted him inside that farmhouse--------but there WAS some indication that it was a murder/suicide as soon as he entered the premises. What it was,we might just find out one day,but he didn't make anything up and was so confident of his findings that he went off for a game of golf.
Because the scene had described a murder/suicide,it was June who was the first suspect and headlines were being prepared to that effect until a journalist turned round with news of it having been Sheila,so the headlines quickly changed from " grandmother " to Sheila.
NONE of us know the full story of how it came about that it was murder/suicide. We can only guess as we go along.