I really don't think it is.
There has never been a feeling that Glasgow or Edinburgh or for that matter Scottish have ever been tight with crossing airspace. In fact past history has proved they have given it. Creating lots of work for themselves and then been shafted by the pilots doing something stupid. Biggles crashing in Dundee is a prime example.
Where else has someone put the work to allow gliders to cross airways with minimal fuss.
From the folk I know at Scottish if you were say trying to do a trip from the Highlands down to landsend they would be routing for you to complete it. And would only ever refuse you if it was impossible to do and there was a real safety reason.
Scottish info is pretty good at jigging things up ages before you get anywhere near controlled airspace.