You will be aware that even if the creditor does not agree to the IVA proposal, provided 75% by value of the creditors who vote at the meeting agreed to it, then the other creditor is bound by it.
I am rather surprised that the police are not taking this seriously.
This is certainly harassment for the purposes of the Protection from Harassment Act. Harassment is defined as a course of action intended to harass and this clearly falls within that category. This is criminal
Some police forces deal with harassment very seriously and others (as seems to be the case here) seem to take it less seriously. If whoever you are speaking to is adamant that he is not going to issue even a warning, then you need to speak to a senior officer in the police force and if necessary make a formal complaint. What you have been told about the police doing nothing until something happens is not correct. Imagine the scenario if they couldn’t do anything until someone was actually murdered!
Whilst threatening criminal damage to property (shooting the daughters horse) is not a threat that he is making he is actually threatening to get someone else to do it.
I would really press this with the police. If necessary, involve the local newspaper.
You can get a court injunction but you will probably find that’s a waste of time because people in situations like this clearly think they are above the law. Only a fool would actually put in writing on the Internet that they are going to get somebody to cause physical harm and criminal damage. So, even if you got a civil injunction it’s likely to be of limited effect. One think it would do of course is, if the injunction is breached, make the police take action.
Applying for a civil injunction is not really something that you might want to do yourself unless you have particular experience of doing it although because of the nature of the threats and because of your sons disability, you may be able to get legal aid so it would certainly be worthwhile investigating that.
Can I clarify anything for you?