Why do all the controllers 'down south' have Scots accents, and all those north of the border ... even unto INV ... have English accents?
Simple. All the busy complex airfields and centres are down south and they need the higher quality of staff to keep them running.
Also there is a policy of improving the stock in the south, so they send the scots and irish down here to breed with the natives. . .
Please start abuse now. . . .