Keep fighting. Local council 'consultant reports' are usually flawed and have major 'holes' in them given that they are usually rushed through to try and back up the incompetence of local councillors. Councils make money from houses not business rates I'm led to believe and if this is the case then this must further blinker their already blinkered and short term views. If there is enough aviation interest in Filton and this interest will create employment then it is worth fighting for. When you take local councils on with a reasoned and robust argument then you start to see their incompetence come to the surface for all to see. Best of luck.