Am new to Flyertalk so am not sure if I am posting in the right place. I was in the Chester/Liverpool/Manchester area (UK) today and noticed an all-white plane flying around as though pilot training. Very big. No livery painted on it, upturns at the end of the wings and a small set of 'wings' near the rear. My immediate reaction was, it looked like flying dolphin. Anyone know what this could be?