I understand they have a legal right of access and my son has no issue for them using it for services. He has no issue for works, maintenence, bins, but not to simply take their shopping in and having a peak in his home at the same time.
When he said they need to ask, they have been awkward since. They were like this when they both had to replace a mutal boundary due to storm damages. After my son collected cheap quotes, approved by neighbour, then asked for money, they said he was being awkward and they didn't know where they would be getting it from. My son had to pay the lot. So yes, if they don't like a terrace house, don't buy one. My son knew anout the service access and joint costs and is more than happy contributing his share and allowing access when it's used correctly. They just want to come and go as they please.