I will be so fed up if the script writers continue the siblings fight over one person line. We had that with Ed/Wll and Emurrr. Then with Rex /Toby and Pip and it seems they're building up some rivalry between Elizabeth and Shula for Dr Locke. Elizabeth definitely deserves some love interest and I'd have been reasonably happy to see her having a fling/long term relationship with Richard Locke. There is a track record though isn't there, in her youth, Shula had a relationship with Nigel. Nigel was too silly for her and later, he and Elizabeth fell in love and made a very good couple.
I've long wished the story line would involve Lizzie meeting up with an old school friend of Nigel. He'd be good looking, have had a giddy youth like Nigel did but now be a mature chap with pots of money. They would stay at Lower Loxley but spend the rest of their lives happily together.
Meanwhile, Alistair would die a sad death, possibly he'd be kicked by a horse or cow. After a period of mourning, during which his gambling debts/secret lover may be discovered, Shula and Dr Locke would rekindle their affair.
As for coercive control - I don't know the law about that but, I expect it wouldn't be the victim who took the offender to court. That doesn't happen in the criminal courts, is the police who investigate and the CPS who decide whether the case has merit. If Helen is found NG it can only be because a jury is persuaded she acted in self defence. If that's the case, the police have to investigate Rob. They already know he was stalking her via her mobile phone. Historical allegations of rape in marriage are notoriously difficult to successfully prosecute (well most rape allegations don't go to court, and a large proportion are NG findings). There is no independent evidence to corroborate what Helen alleges. Perhaps we need one of those on line petitions, to find the Ambridge One not guilty of wounding with intent.