If your purpose is different from that of "name", maybe you should use a different key. osm.wiki/Key:name has a variety of existing options for different kinds of name. Alternatively you could use name:university_of_cambridge (by analogy with ref:university_of_cambridge) if you want a way to reference the University's name for something where that differs from the name marked on it.

Then I think the "map what's on the ground" principle on osm.wiki/Good_practice means we should use the name on the substation identity plate rather then the one in your database.

Hello. What's your source for this new name? I checked the plate on the substation gate on my way home and it still says "ROYAL GREENWICH OBSERV".

Did you really intend to map the Harston war memorial as the offices of Sphere Medical Ltd?

There's a sign next to each entrance to those paths saying "Private Grounds". I've added source tags to indicate this.

I visited Shire Hall today to check the County Council's records, and they believe that the entire parking bay, including the footway behind it, is part of the highway.

I've reinstated the tags, and added access=private which would seem to capture the intent behind these changes, and the situation on the ground.

I've roughly updated that, which turned out to be fairly easy.