I have read all the details. What do you want to know about this?
It seems rather odd that the neighbour agreed where you could place the post and then wanted it moved.
You can write to the solicitor and tell him that as far as you’re concerned, if you don’t hear from him with regard to a surveyor, within the next 10 days, you are closing your file. Alternatively, just let sleeping dogs lie although it does mean that this is hanging over you and I’m sure you would rather have a conclusion. You are at liberty of course to get your own surveyor to provide a report on the boundary and where it should, in his opinion actually be, and then you can present it to his solicitor. Boundary surveyors report is likely to cost about £600 which might be why the neighbour is reluctant to pay it. By suggesting that, he might just be making noise.
Can I clarify anything for you?
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I would simply tell him that as far as you are concerned the matter is closed until you hear from them regarding the results of the boundary survey. I would leave it at that. If they want to raise the issue at some stage in the future you have to deal with it. Ultimately, the neighbour can send all the letters that he likes but if you simply refuse to action them, he will have to issue court proceedings in court proceedings is going to issue bearing in mind that he doesn’t seem to have any evidence.
Check your house insurance to see if you have legal expenses cover and if you have, pass this on to your insurer to deal with.