Brain Fade,
Im sure its nothing that you havent been told before but Edinburgh Airport management has always had a reluctance to allow aircraft to perform visual approaches. When I first arrived it was an instruction from EAL that controllers were not allowed to offer visual approaches, since then visual approaches at night have been banned and more recently, that on 24 you can now not join final at less than 7 miles. I cannot be sure about the reasons for this but given the procedures seem to be more restrictive on 24, I dont think it takes a psychic to realise that there may be certain influential people living along the south shore of the Forth, who have a say in the matter. I know of one individual who tracks inbounds for 24 and outbounds from 06. He is on the phone the moment he believes any aircraft has deviated from the appropriate route.