The procession will be led by the band of the Grenadier Guards to the chapel
It will be followed by military chiefs and then Prince Philip's Land Rover hearse
The Duke of Edinburgh specifically designed the vehicle himself over 16 years
Then come key royal family members, including his four children in age order
Princes William and Harry will follow, with Princess Anne's son Peter Phillips
Palace has not explained move, though Mr Phillips is Queen's eldest grandson
The Queen is due to follow in a state Bentley, accompanied by a lady-in-waiting