To directly answer your query, Glasgow will let you through- even if you sound like a complete plonker, if you route a little to the east Edinburgh will also let you through, but sometimes with slightly more hassle.
Coming up the east side Newcastle/Teeside are excellent at giving transits.
Leeds/Bradford well yes but.
Birmingham not bad, ditto Liverpool.
Manchester - remain clear blah blah
Aberdeen - pretty good will almost always let you through.
The MATZs Leuchars and Lossiemouth tend to be OK unless htere is an exercise on, or unless their gliders or piston trainers are around at the weekend and then you get 'cleared MATZ penetration at 3000' dugh....
Enjoy the serious scenery and don't get downwind of the hills!