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