in all honesty, how long do you want to wait? it's been going on since last year already, and you are already spending so much time (money?) to, it seems, prove a point of principle to the council. If the money is doable and you want to get on, my advice would be to just pay it instead of spending hours of your life on searches that will in all honesty probably prove fruitless and do your head in, finding more elaborate ways of getting out of it (suing the council because they didn't know about a name change???!?!?)
Even if the council eventually (in 6 months? in 2 years? 3 years? five years?) decide that it is their responsibility , do you think they will do it immediately? I suppose it depends on how long you want this to go on for. By the time you have proved your point of principle, another local government may well be in place, one who dosen't look as favourably on your planning application, and you might not get permission at all!