We don't know if Neville gave Jeremy an ultimatum latterly regarding Jeremy's future in farming,i.e. to take over from his father as Neville considered retiring.
For all any of us know,there could have been a conversation pertaining to this that someone had overheard------------and passed on. This being so would have ruffled a few feathers,especially if the conversation was overheard by Chris Nevill who lived abroad. Nothing like buggering off and leaving a sour taste in the mouths of those who WANTED a vested interest.