4th January 2013, 12:13 AM
No, I don't think so - bodies commissioning work can choose whatever criteria they wish, however weird. It may be that the waters have been muddied in the past by curators trying to limit approved contractors for a commissioner to choose from, which are more subject to public scrutiny, and/or the wariness of employers' personnel departments about imposing MIfA membership as a requirement for appointing staff.