Bamber may have had a controlling share of the caravan park. Assume Nevill had the biggest share.
However that would not change what AE's share was. So the Eaton's were no worse off.
I thought it was Jean and that she and Ann were at par? Nevill was certainly involved, as was Robert, but I always thought the shares were in the names of the two women, Jean and Ann, and Jeremy was brought in as part of giving him a stake in things. I note that the family have continued that tradition of female-direction of the holiday park up to this day.
I may be mistaken, but my understanding is that Jeremy already had a share, but that could have been taken from Jean's share, so it's not necessarily the case that he more than Ann, and even if he did, company law doesn't quite work that way. To control a company, a shareholder would need at least greater than 50%, and preferably at least 75%, otherwise he can be hindered by minority shareholders. It could also be that the constitution of the company - its Articles of Association - were crafted by lawyers to allow for a cross-family management situation such as this.
This is why I think the whole thing needs deeper investigation, not just off-hand glib utterances of 'he controlled this, he controlled that'. I appreciate the Eatons and Boutflours were not lawyers and may have made certain assumptions that drove their motives, but they were businesspeople and would have had regular consultations with their private lawyers and developed some understanding of the true situation.