The Queen wore two crowns for her coronation: the St Edward's Crown, which she has never worn since, and the diamond-encrusted Imperial State Crown, which she wears at formal occasions such as the opening of parliament when she delivers a speech outlining the government's legislative plans.
The documentary has also revealed some of the most valuable gemstones of the British crown jewels were kept hidden underground in a biscuit tin during World War II.
One of the scenes shows the Queen describing the crown, which weighs nearly 22 pounds as "very unwieldy", to which Bruce adds: "It's hard to always remember that diamonds are stones and so they're very heavy".
Following the orders King George VI, father of Queen Elizabeth II, the guards concealed the precious stones in biscuits and buried them in a deep hole, below a secret exit of the Windsor Castle. "Because if you did, your neck would break". "It would fall off", the queen said in excerpts released ahead of the program.
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Dense fog is expected on Thursday with temperatures expected between 20°Celsius and 6°Celsius. Dense fog has affected visibility in Delhi, Haryana, Punjab and Uttar Pradesh since Monday.
In the upcoming BBC documentary The Coronation (Jan. 14, BBC One), Her Majesty, 91, gave a rare insight into her life as head of state. "But once you put it on, it stays. I mean it just remains on", she said.
"So there are some disadvantages to crowns, but otherwise they're quite important things".
The crown features a gem known as the Black Prince's Ruby which is believed to have been worn by Henry V in his helmet at the Battle of Agincourt in 1415.
The Queen acceded to the throne on February 6, 1952, when her father died unexpectedly in his sleep at Sandringham in Norfolk. She recalled the Coronation journey from the palace to Westminster Abbey.
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He expressed his regret and frustration at the situation and that there has not been an improvement despite increased investment. The HSE has said this afternoon that flu cases are increasing and advised people showing symptoms not to go to work or school.
Apparently the royal golden carriage was also pretty uncomortable - or to use the Queen's word, "horrible".
"I remember one moment when I was going against the pile of the carpet and I couldn't move at all", she said.
The Coronation is part of the Royal Collection Season on BBC and will air this Sunday.
The story of how the service, which lasted nearly three hours, was briefly brought to a standstill has emerged in The Coronation, to be broadcast on BBC One on Sunday.
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Kate joined a group of schoolchildren for arts and crafts in partnership with the mental health charity Place2Be. The royal teamed the coat, worn over a Seraphine floral print dress, with navy Jimmy Choo high heels.