The Coronation will see the 91-year-old monarch in conversation with expert on the Crown jewels, Alastair Bruce, as together they re-watch footage of the day and recount memories of everything from the uncomfortable carriage ride and her children not doing what they were told to how she managed to keep the crown on her head. "You can't look down to read the speech - you have to take the speech up - because if you did your neck would break" she exclaimed.
"Because if you did [look down] your neck would break and [the crown] would fall off", the queen said, smiling as she tilted her head downwards.
"So there are some disadvantages to crowns, but otherwise they're quite important things", she added.
The Queen said the coach can only go at a walking pace and the horses could not go any faster as it was so heavy.
Discussing her long walk to the throne, the Queen then admits she was brought to a standstill when her long robes dragged on the thick carpet in Westminster Abbey, the Guardian reports. "They dug out this fresh, very virgin white chalk and they had to hide it with tarpaulins so when the aircraft flew over at night no clue was given to the German Luftwaffe that anything was going on", Bruce wrote.
"I was aghast because I had no idea that they had been there".
"You see, it's much smaller isn't it?! the Queen says in the interview, gesturing to the height of the crown's arches".
A trapdoor used to access the secret area at Windsor Castle, where the Queen spent her war years for safety, still exists today. "That sort of pressure that you mustn't make an error, for the first time being filmed and televised to the world", he said.
"What fascinated me is the idea of the royal librarian gauging out the Stewart Sapphire, the Black Princess Ruby, the Edward-the-Confessor sapphire, just gauging them out with a pen nearly, and a knife, and sticking them into this little circular tin, and getting them ready so that they could be rushed away to an even more secure place". Can you imagine having that sort of pressure on you?
Mr Bruce said the head has to be kept still when wearing it and the Queen agreed: 'Yes.
The documentary is part of the Royal Collection Season, a major partnership between the BBC and Royal Collection Trust, which also features the four-part television series Art, Passion And Power: The Story Of The Royal Collection. "I think she's very humble toward the role that she holds, and that makes her unwilling to be too ponderous or to dwell in anything other than a delightfully light way".