The Queen arrives at the Royal wedding

The Queen's arrival at St George's Chapel for her grandson's wedding meant the entire guestlist was present at the venue.

Tradition dictates that Her Majesty is the last to arrive at Royal engagements, visits and events – and the protocol even extends to her family's weddings. 

She will watch Meghan Markle walk down the aisle to royalty and an awaiting Prince Harry.

And guests will have to be on their guard for another tradition which means when the The Queen stops eating, others must do the same. 

The protocol usually relates to banquets, and with 200 guests set to sit down for an evening meal as part of the celebration, it is understood the custom will have to be adhered to. 

But those worried about scoffing down their food as soon as it lands on their table might not need to worry given that the Queen has been known to push a morsel of food around on her plate to allow people to finish.

Last week, the official document signed by The Queen granting permission for Prince Harry and Meghan Markle to marry was released, incorporating the symbols of America onto traditional vellum to represent the bride.

The ornate Instrument of Consent, the official document confirming the approval of the Queen, features emblems for Ms Markle including a rose, the national flower of the United States, two golden poppies from her home state of California, and olive branches adopted from the Great Seal of the United States.  

The Queen signed the Instrument of Consent in March, at the top of a vellum document transcribed in calligraphy and issued under the Great Seal of the Realm.

The document states: "Now know ye that we have consented and do by these presents signify our consent to the contracting of matrimony between our most dearly beloved grandson Prince Henry Charles Albert David of Wales KCVO and Rachel Meghan Markle."

Prince Harry, as sixth-in-line to the throne following the birth of Prince Louis, had to seek the permission of the Queen under the Succession to the Crown Act 2013.

The Act requires the first six people in line to obtain the Queen's blessing to marry, unless they wish  to be disqualified from succeeding to the Crown.

A very traditional ceremony 

The couple will be make their vows at St George's Chapel, which last hosted a royal wedding in May 2008 when Peter Phillips - son of The Princess Royal - married Autumn Kelly. 

The traditional ceremony will be conducted by The Dean of Windsor, The Rt Revd. David Conner while the Archbishop of Canterbury, Justin Welby, will officiate as the couple make their marriage vows.

Pioneering American bishop, the Most Rev Bishop Michael Curry, from Chicago, Illinois, has been invited to deliver the address as the couple strive to reflect their transatlantic relationship amid the tradition of St George's Chapel.

Bishop Curry, who has been praised for his "infectious laughter and self-deprecating humour", is the first African-American bishop to have served as the Episcopal Church's presiding bishop, a role he has held since November 2015.

The music will also have an American influence according to Christopher Warren-Green, who will conduct musicians on the day.

Miss Markle, who was a UN women's advocate, is unlikely to opt to obey the prince. The couple will probably choose the Series One (1966) Book of Common Prayer ceremony, just as the Duke and Duchess of Cambridge did, which allows the bride to drop "obey him" and "serve him" from the religious proceedings.

The regiments Prince Harry served with in Afghanistan will a have a “special place” during the ceremony.

The 3 Regiment Army Air Corps, where the prince served as an Apache Pilot in Helmand Province will be represented, as well as The Royal Gurkha Rifles, his comrades in Afghanistan in 2007, and RAF Honington, where he is Honorary Air Commandant.

Household Cavalry troopers will line the staircase at St George's Chapel, while streets within the precincts of the castle will be lined by members of the Windsor Castle Guard from 1st Battalion Irish Guards, and by Armed Forces personnel from the Royal Navy Small Ships and Diving, which has the Prince as Commodore-in-Chief, and the Royal Marines, where he is Captain General.

Read more about St George's Chapel here.

WATCH: How Diana, the in-laws and Prince Louis will fit into the Royal Wedding

Don't miss the procession

After the ceremony, among the first people to congratulate the couple will be some of the 2,640 charity workers, community champions and local school children who are being invited to watch the wedding from inside the walls of Windsor Castle. 

Then at 1pm, the newlyweds will undertake a two mile tour of Windsor in an Ascot Landau carriage, greeting well-wishers, which is expected to take 25 minutes.

It's the same carriage the prince used in the procession at the wedding of Prince William and Kate Middleton,when he was surrounded by small bridesmaids and page boys.

The couple will leave Windsor Castle by carriage via Castle Hill, travelling along the High Street and through Windsor Town before returning along the Long Walk for the first reception at St George's Hall.

Read more about the procession here.

Flowers

The couple have chosen high society florist Philippa Craddock to design their day, using seasonal plants and flowers from the Crown Estates and Royal Parks chosen particularly for their pollinator-friendly properties.

Aisles, pews, tables and halls will be lined with plants from wildflower meadows, picked to “provide a great habitat for bees and help to nurture and sustain entire ecosystems by promoting a healthy and biodiverse environment”, Kensington Palace said.

Ms Craddock has been named “Queen of London florists” by British Vogue and “a floral mastermind” by Tatler.

Peonies are one of Ms Markle's favourite flowers, so it is likely her floral bouquet will include these fragrant blooms, which are in season in May.

Read more about the wedding florist here.