Thanks guys, my brother is a kite designer (lives in Taiwan most of the time) and had a selection to choose from but it was 'bracing' up there in the morning so in the end only needed a small parafoil with tail spinners to keep it stable. It is a slight shame it was too windy for the big one which is a near full size blue whale that gently bobs up and down as though swimming, that will fly endlessly in as little as a 3 mph breeze!
My dad had made that request many times over the last 25 years or so...