These preparations involve the polishing of 5,500 silver-gilt pieces and 2,500 glass items, Harrold says.
"Five days before the dinner, the team constructs the horseshoe table," the etiquette expert states, referencing the table at which the banquet's attendees sit.
"Two days before, the Yeoman of the Glass and the China Pantry folds the napkins embroidered with the Queen's monogram in a Dutch bonnet shape, and flower arrangements are started which will include 31 floral arrangements."
Today, Buckingham Palace staff will have begun laying the table for the banquet at around 8am.
The dress code, Harrold explains, is white tie or full service dress, which includes decorations or military service medals.
What takes place during the state banquet?
Before dinner is served at a state banquet, the Queen delivers a speech to her guests.
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The monarch proposes a toast to the visiting head of state, who then in turn proposes a toast to her.
The dinner lasts for around an hour and 20 minutes, Harrold says, beginning with an orchestral performance.
According to the former royal butler, the meal typically consists of dishes including salmon, venison, apple crumble and a selection of fruit.
Following the meal 12 pipers walk around the room while playing their musical instruments, a tradition which was begun by Queen Victoria.
The guests are then led into Buckingham Palace's State Rooms, where they are served coffee and handmade petits fours.
http://www.independent.co.uk/life-style/food-and-drink/trump-uk-visit-state-banquet-rules-tradition-queen-buckingham-palace-melania-royal-family-a8941671.html
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