You entered into a contract to pay him on the day and therefore, you are not entitled to decline to pay him because of his attitude. I can understand why you were annoyed though.
If he does call on anybody’s door, what he is alleging, then it’s harassment and it’s a matter for the police.
Harassment is defined as a course of action (more than once) which is intended to harass, does harass, is reckless as to whether it harasses, or if the average bystander would look at the conduct and think that it was indeed harassment.
Harassment is both a civil matter and a criminal matter.
If you are being harassed. Go to the police and ask them to warn the ex-under the Protection from Harassment Act. Some police forces take that very seriously and others not so and therefore, you may need to speak to a senior officer or put a complaint in writing to the Chief Constable.
I don’t where he put the allegation of threatening to kill him, but if it was on the public forum, that is harassment and defamation.
I’m sorry to say that I cannot see a reason not to pay him. You have a whole load of other courses of action in respect of defamation and harassment but no excuse not to pay.
In these circumstances, in respect of the money, the police would not be interested.
My advice would be to pay him what you him and then send him a cease and desist letter and ask him for compensation in respect of any of his allegations which he either said or wrote to 3rd parties.
It depends whether you just want to walk away from this.
If is put a bad review on trust. Although beware because they can come back to bite you also.
Can I clarify anything else for you?
Please note that my answer is based strictly on the information that you have given me. If you have not given me all the information, then my answer may be incomplete or wrong.
I am happy to answer any specific points arising from this.
If you still need any points clarifying, I will be happy to reply because the thread does not close.