Backpacker, did you do your Nav Exam in England?
No, at OFT in Florida. The cubicles as a whole were maybe 1x1.5m, with a table of 50x50cm bolted to the wall. Add two chairs and two people and they were very, let's say, intimate. Especially when you closed the door, which swung inwards.
Needless to say, pre- and post flight briefings were kept rather short in there. We preferred to do them somewhere else.