I drove a converted ex- London Transport double-decker bus for two months on a promotional tour for Buena Vista (Disney`s video marketing division) promoting a “Lion King” video.
The seats had been removed and the bus converted into a video theatre/ painting room/ computer room.
I dont hold a PSV licence but didnt need one as the bus had been re-registered as an HGV.
Not sure if this is relevant to anything at all…
Vince