Mr Grubby, what you say merely confirms what I've always said; people with degrees have the wrong sort of mindset for ATC (mostly!)
Everyone else: I don't doubt that academic qualifications really don't matter, it's aptitude that counts. I know a FISO (Aerodrome) who was absolutely ace and would have made a superb ATCO, but he only had 2 'O' levels so couldn't even be an ATSA with NATS!
But with all the aptitude testing and interviews we still (well not me any more but my old unit) get people who'll never validate in a month of sundays despite having high percentage passes in all the tests, so I reckon it all goes back to selecting the wrong ones in the first place.