Macro to the rescue once again!
Thanks, really appreciate it.
Edit:
Oops, not quite working, returned a total of 18 users, and on the board I see some without a sig that are not in the listed 18. Also, 18 out of 3,200+ doesn't seem quite right.
Makes me wonder whether I would get different results if I were to run this from mysql> rather than through the board, will test that out tonight.