Fully agree with you Hugmonster re the examples you give. And there are many more. But that's yet another subject. I'll tell you something else, until some years ago we already had a cue as to who was calling simply by the accent. That doesn't work any more either. Bugger it I don't care, Jersey can keep their callsign; I'm off to watch footy on the box!
P.S. By the way boys, I do know all about the former British European Airways. Apart from flying on most of their fleet I remember well the daily confusion between London and Preston ATC (I worked at Preston) with the BE5055 to GLA and BE5505 to EDI. London often got them mixed up. Caused an airmiss once. But that's another story.