Ever since Tyra Banks launched that global blockbuster built around the "America's Next Top Model" franchise, production companies worldwide have been writhing in agony , trying to brainstorm their very own model TV blockbuster. When TI read on fashionologie yesterday that Miss Posh's name has surfaced in conjunction with that previously mentioned mystery "Simon Fuller NY agency" buzz that prompted a call to our London Squad. "TV..Model TV..." was the hint that came back. Posh Mgmt...I can just see the comp cards already. Think a series of legs in a Marc Jacobs shopping bag.