"Albion" for Northeast. That's quite imaginitive. Wonder where the yellow folks came up with that one ? It's more original than "Northeast" if nothing else. I find it difficult to imagine the Viscount flights using the "Speedbird" c/s when the Northeast aircraft were repainted in the BA colours. Much as I love the old aeroplane it just doesn't strike me as a speeding bird !
BKS is a little before my time so I'll take anyone's word on that. British Island clearly used the same c/s when the company reappeared in the early eighties. As for Air Anglia, what could be simpler ?
Dan Air I do remember. Just Dan Air plus an alpha-numeric suffix that bore absolutely no relation to the flight number (scheduled flights only). DAB6ER was LBA-GLA, flight number DA064, I think. Something to do with a never- ending experiment into minimising callsign confusion.
Oh dear, now I sound like a perfect anorak. Back to the pills for me...
Seriously, thankyou for all the replies so far.