Oh! There it is!
(Bridge of Allan)
Universal really isn't the easiest place to find, just like you said. The map on the Top Secret Glasgow website review helped me out fine, along with the reference to Waterstones!
At first glance up the lane, I couldn't see it, despite the big wertical sign. All I could see were big bins!
Once inside, it felt like being a LONG WAY from the city centre. And all those leaflets about what's up and coming in live ents were very useful.