In response to astir 8's post,
Westerlies still produce excellent wave in Scotland, however, some of the most extreme wave we have experienced in the gliding world here in recent years is actually produced in southerlies. To the north of the Cairngorms and towards the Inverness area we have managed fantastic wave climbs. I have enjoyed several 20k plus climbs and excellent cross countries. A number of diamond heights have now been claimed in this area, with wave systems seen working even higher(possibly 40k plus) towards the west coast. On most occasions, a 2000feet aerotow is more than sufficient to contact the wave.