Just got back from a two week vacation in Scotland (city of Ayr, relatively small community on West Coast). This was my first visit to Europe, and I expected to see cyclists everywhere. Not the case, however. I saw maybe 15 transportation cyclists the entire time - not much different from the US.
This is with gas running £1.10 per liter! On the other hand, the roads are amazingly narrow, with no shoulders, lots of cars, and everyone drives extremely fast. Not sure I'd ride on the road either.
I did see a few MUP's, but no bikes (lots of walkers and baby strollers though).