Was this the Sandringham that Charles Blair brought over to the UK in the 70's? If it was I flew on it, we took off from the Solent and flew around the Isle of Wight while his wife who was a famous actress (Maureen O'Hara?) sold tee shirts.I have some K64 slides somewhere of the occasion, might even have the tee shirt somewhere. Later CB killed himself in another flying boat and it was found that he had been falsifying the maintenance records of his aircraft.Also there was a statue of him on top of the Queens Bldg at Heathrow.