Here's a working office that I'd heard of: V Cars are one of Bristol's biggest cab firms, and the only one whose phone number I have memorised. On my first trip in one, back in 1999 (in a differently-named, earlier incarnation, I think), the driver said to remember the number as "Christmas Day, Boxing Day, Boxing Day". Most (all?) central Bristol phone numbers were prefixed with a 9 back then, so you just needed to add 25, 26, 26...
There was even a cab dispatcher at work behind the window, from what I could see. It reminded me of my childhood, when my mum worked as a dispatcher at Radio Cars in Ilford.
GPS Coordinates:
51.43931, -2.62653
Location: Ashton Vale