Ask an Property Solicitor. Get an Answer ASAP.
The starting point for these types of disputes is to look at the plans for both properties and to see where the boundary line is from the plans. I would also if there is a dispute to instruct a chartered surveyor to inspect the boundary and prepare a report. They can look at the various boundary lines and provide a report setting out the line. If there is any trespass by them on any part of your line (even with a washing line) then you can ask them to remove and again I would be minded to put it in writing to protect yourself going forward. happy to discuss and please rate positive.
There is not really a form of words. I would simply state that it your boundary and this is a technical trespass and you do not give permission for same and as such it should be removed immediately. I hope that this helps and please rate.
Yes that is right. You do not need to go through a solicitor although it is worth checking whether your house insurance covers this type of dispute.
My pleasure and please rate positive. I can still help.