Her Majesty's coffin has so far been carried by a bearer party of eight pallbearers from the Royal Regiment of Scotland and The King's Body Guard for Scotland, who carried the late Queen into St Giles's Cathedral in Edinburgh, while a bearer party from the Royal Air Force was raised to convey her coffin onto the aircraft at Edinburgh Airport for her journey to London.
A bearer party from the Queen's Colour Squadron (63 Squadron RAF Regiment) carried Her Majesty from RAF Northolt into the state hearse for her journey to Buckingham Palace on Tuesday evening.
Royal coffins are lead-lined, creating a lead casket inside the oak coffin, to help preserve the body for longer in an airtight seal while the deceased is lying in state and for when they are laid to rest above ground.
In the case of Her Majesty's final resting place, she will be interred at the King George VI Memorial Vault alongside her late husband Prince Philip, and other late members of her family including her father King George VI, her mother Queen Elizabeth The Queen Mother, and sister Princess Margaret.
The vault is at St George's Chapel in the grounds of Windsor Castle, which has been the final resting place for members of the Royal Family since the 15th Century.
The coffin which was made for her majesty 30 years ago is made from English Oak, and lead lined making it extremely heavy...
No-one knows the precise weight but it;s estimated at around 700 pounds ..
The Queen's coffin, adding to the weight, is also fitted with brass handles and other fitments, including fastenings to attach the Imperial State Crown, the sovereign's Orb, a golden globe that dates back to 1661 which is symbolic of the monarch's power derived from God, and the sovereign's Sceptre featuring a cross which was also presented at her coronation and which has been part of every coronation since Charles II in 1661.
Specialist funeral directors Henry Smith, which went out of business 17 years ago and also made the Duke of Edinburgh's casket, is reported to have made the Queen's coffin before maintenance of the casket was then said to have passed to funeral directors JH Kenyon Ltd of London.
North London-based company Leverton and Sons was put in charge of Royal funerals in the early 1990s.
Andrew Leverton, who manages the family business, told the Times newspaper in 2018 that the Queen's coffin had been ready for decades, adding: "It is made from English oak, which is very difficult to get hold of. Oak coffins are now made from American oak.
"I don't think we could use English oak for a coffin now. It would be too expensive."