I just took a look at my files. It appears they started adding the OT levels just recently in The Auditor UK 343 [ circa June 2009 ]. Before that they only listed the services they delivered.
I have no idea if they stopped publishing the ADVANCE UK magazine. I haven't seen one of those in years. If anyone is hanging on to old Scn Mags from the UK or ANZO, I'd really appreciate a PM.