Surely Pinkerton House ?
Gp Cpt George Pinkerton, chairman of the Scottish Flying Club when it bought Couplaw farm in the 1950s, was the pilot who shot down the first German aircraft over British soil in WW2.
He was still chairman in the 1970s when the airfield was given to the RAF Benevolent Fund so it "would continue to be used for flying". This is probably why many people think it is an ex-wartime airfield.