Whilst it took a while for the council to be dragged into the modern world, they can not be held responsible for any current or future deficiencies since night ops are allowed now. Furthermore it is still debatable if there will be sufficient demand for airlines to make use of any runway extension.
In short the airport is not fit for purpose when it is busy. The crude saying 'you can't polish a turd' ties in nicely to the endless renovations that take place in the terminal which never really seem to tackle the root problems anyway. You often still can't get a seat when it is busy and baggage reclaim areas are still a rugby scrum at the best of times.