[Trucktastic]

This is bloody horrid, Honey. This guy is a nasty piece of work, and I think your brothers are not helping matters. If the guy comes round to your house, the only thing you can do/must do is call the police on 999.
They will be there in minutes and they will deal with him. If he has been threatened with prison, one more charge will put him there.
Whatever your brothers tell you to do. You do not need the worry at the moment. Your brothers have done nothing to help the situation, you are dealing with it, like contacting Trading Standards and the hire companies (that was a great thing to do, well done you!). They are just staying out of the way and mouthing off, but not doing anything helpful or constructive.

And most likely, they won't do anything to the guy anyway, it's probably all hot air.

Write the letter, then leave it to Trading Standards. if the guy comes round to your house, CALL THE POLICE ON 999!!! I can't stress this enough (I'm biased, I work for the Police), they will help you. They will get him off your property, they will arrest him if needs be, he will not be able to cause you problems. If he is on probation on that other charge you mentioned, he will be returned to prison straight away. And now the law has changed - the police and the Crown prosecution service can and will take away his assets so he will not be able to carry out crimes again.
And if/when he gets out, he will, most likely be sent to another part of the country rather than where you are. So you don't need to worry about that either.

Don't forget - you are doing the work here, not your useless brothers. And if he comes round, CALL 999!!!!

Lozx