It is a bit of a pain that there's that much controlled airspace right across the country (just like the Manchester TMA) but in reality you just head for Cumbernauld and beetle through between Glasgow and Edinburgh. Scottish Info on 119.875 are always very helpful but if you stay below 2500 feet you don't even have to talk to them if you don't want to. Or if you're going up the East coast just head for North Berwick and hop across the Forth to Fife and on up from there to the best flying country in Britain.