Ah, you are interpreting the Jimmy was inferring a “thing” known as a ‘home callsign’. He could have simply been using ‘home’ as an adjective to indicate the callsign that one would use from the home QTH.
Do current licence documents issued to stations in GD, GJ, GI, GM, GU all display the pure callsign without the secondary locator then? They always used to show, dare I say it, the home callsign.
Anyway, dunt affect me. CCL.