If you're looking for something to do this weekend there's a two-day sprint event on at Kames near Muirkirk in Ayrshire (where the next SEC track-day is). The track and the facility in general has been totally revamped and there's a cracking new (and cheap) menu at the cafe. The whole place is MUCH better than it used to be and it seems the expected turn-out for the two days is quite large as a result of all the changes.
If nothing else the run to the track is great fun in itself, along some excellent A and B roads (Muirkirk is on the A70) that are usually lightly trafficked. Takes about 35-40 minutes to reach it from Glasgow.
There's more info' on the East Ayrshire Car Club web-site (Google it!).