(29 Apr 2017, 9:17 am)Dans_bus_photos wrote Ive noticed 4937 also has the same advert, so not sure if its the replacement or there was 2 for Deptford. Surely would have made more sense to put on the 54 plate scania's
It's all managed through Exterion - bus operators will have a contract with Exterion and to my knowledge they have a copy of what is essentially the company's fleet list, with what kind of advertisement boards each bus has (if any).
Go North East will also say they are happy for x number of buses in the fleet to have mega-rear advertisements, but I think that's pretty much where Go North East's involvement ends, and they don't get a say in which buses are fitted and when. Places like Dalton Park will contact Exterion and ask if they can arrange for adverts on buses in the area, and Exterion will go ahead and do it, giving operators a percentage of the money they've taken to do it.
..or something like that!