Queen has urged Prince William to stop flying in helicopters with his wife Kate and their three children over safety fears.Queen Elizabeth II is reported to be "terrified" a disaster will strike threatening the throne.An unwritten rule stops senior royals flying together.The royal protocol was relaxed as William's family were young and split there time between Kensington Palace, London and their home at Anmer Hall, Norfolk.An insider close to her Majesty revealed she has raised the concern with the future king explaining how she is "terrified" a disaster will take place.39-year-old William is in line for the throne after his father Charles, 73, serves as king.William will then be followed by his eldest son Prince George, eight.Previously,.
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