Is there much to gained (or is that lost) by having the ground plane when doing quick verification tests on bench for pre compliance? I've not bothered, I tend to do a quick scan to make sure it's not obviously going to fail, and make sure I'm a few dB below limits and its always worked out so far. Guess it wouldn't take much effort to put some kind of plane on the bench, maybe a big sheet of pcb would do.
Radiated is harder, I don't bother putting things in the TEM cell until I have a point of reference from a EMC lab, every product gives unique results due to the near field nature of the TEM cell I guess.