Perfectly aware of that, but this is a university site which has in the past ALWAYS had postal addresses with "West Mains Road", and these are still likely to be the addresses of many buildings. For instance "EH9 3JT" is also located in the Ashworth Building and has a West Mains Road street address (source not admissable on OSM).

The reason I made the note was I was sending a letter to someone on the site and was rather puzzled about addresses in it. As the recipient was in this building I could confirm that address with them, but in the past all addresses were "West Mains Road".

NSUL values need to be treated with care in a campus like this as addresses tend to be complicated: some parts have direct mail deliveries, others might get all post via the internal mail system. Sometimes these are for different purposes (e.g. undergraduate admissions, staff & student residential accommodation and research labs). It's hard enough to pick out on my local uni campus, let alone a remote one, even if I've had colleagues working here for past 40 years.