Hi Saviem , in response to your post re the Guy marque, I had the pleasure of running a couple of Big J’s in the late 70’s which were purchased from a well known dealer local to me, having been run from new by H & M Transport from Oxford. They were J Reg i.e 1971 - 205 ■■■■■■■ ,6 speed AEC overdrive box( as fitted to Mandator) and hub reduction axle . Due to the position of the steering column in relation to the other controls I referred to driving them as being akin to driving an invalid carriage -remember them? with a 5th wheel coupling. However they did us proud until it was time to give them the BOC adjustables and despatch them for scrap. A good workhorse with potential! As you said investment where it was needed would and could have been spent on R & D !