I am also from Glasgow and a recent user of Arduino.
I would like to get an Arduino specific group together. In the CCA on Sauchiehall street there is a meeting space for electronics enthusiasts which goes by the name of the Electron Clubhttp://www.electronclub.org/doku.php
I have at least one other person who has indicated that a June meet is possible for them, but if you wanted to try and get something together before then, there is a good chance I will be free. The Electron club recently did a freeduino building class so there are others who have access to the platform
Thinking along the lines of a workshop or show and tell type event? Fancy it...
The club has a mailing list, I would recommend joining up, they have a meeting room that can be booked.