Appreciate all the suggestions, thanks!

Actually think the folding bike might be an option if I can get permission to bring it into the office with me, so will look into that one first. If that is a no-go, then I guess it is the cheapish expendable bike, maybe with a few nice bits on it, but nothing that LOOKS nice!

Funny I never thought about using the U-Bolt as the lock to secure it to something, although it makes perfect sense. Lesson learned for next time!