My understanding is that to award a Sqn or Unit badge there has to be no less than 75 permanent staff on the nominal roll. This came to light when a trg unit in Lincs, with 40 staff, tried to reinstate the original badge it was awarded back in the 30's. Not withstanding it had, on average, 80-100 students at any given time, the agency who authorises the award of badges would not budge. I think they just removed the crown and used it anyway..............