Prince William has revealed that his relationship with the Monarch is so strong that he sees her as a "Grandmother first, Queen second".
In an exclusive interview the Duke of Cambridge tells presenter Alan Titchmarsh his relationship with the Queen has evolved over the years and the pair are "definitely a lot closer than we used to be".
In the documentary Elizabeth: Queen, Wife, Mother, to be shown on ITV1 on Friday night, William said he contacted his Grandmother regularly in the run-up to his wedding to Kate Middleton to ask for advice.
He said: "There was very much a subdued moment when I was handed a list with 777 names on, not one person I knew, or Catherine knew."
William said her advice "was to get rid of it, start from your friends, and we'll invite those we need to in due course".
There is also a rare look at the letters between the Queen Mother and the then Princess Elizabeth and Prince Philip ahead of their wedding.
In one, dated 14th September 1946, Prince Philip writes to the Queen Mother saying:
I'm sure I do not deserve all the good things which have happened to me. To have been spared in the war and seen victory, to have fallen in love completely and unreservedly, makes all one's personal, and even the world's troubles, seem small and petty.
The documentary shows exclusive footage of the royal family's home and Prince Andrew gives an insight into what growing up at Buckingham Palace was really like.
He shows Titchmarsh the passageway where he and his younger brother Prince Edward would play cricket and football, admitting he is still not sure how the pair did not break any of the "amazing glass cabinets" displayed there.
Elizabeth: Queen, Wife, Mother will be aired on ITV1 at 9pm on Friday June 1.