Royal wedding: Prince Harry and Meghan Markle reveal details of their big day

The couple have chosen their horse-drawn carriage for the post-ceremony procession

The Duke and Duchess of Sussex are promoting 15 organisations on Instagram. AP

Thousands of well-wishers will be able to see royal newlyweds Prince Harry and Meghan Markle in person as they are driven through the town of Windsor in an open-topped horse-drawn carriage used for coronations, state visits and royal weddings.

The procession will take place after the wedding ceremony at St George’s Chapel later this month.

In the build up to the big day, Kensington Palace revealed on Wednesday that the couple had selected the Ascot Landau carriage, which was originally built in 1883 and is part of a collection of five carriages in the Royal Mews.

"Prince Harry and Ms Markle are very much looking forward to this short journey which they hope will allow them to express their gratitude for everyone who has gathered together in Windsor to enjoy the atmosphere of this special day," Harry's office at Kensington Palace said in a statement on Wednesday.

Two of the Landaus in the Royal Mews were used during the wedding of Harry’s brother Prince William to Kate Middleton. Prince Harry rode in one of them with bridesmaids and pageboys as part of the procession following the 2011 nuptials.

Speaking about the couple’s choice of carriage, the head of the Royal Mews, Crown Equerry Colonel Toby Browne, said: "It was selected because it's a wonderfully bright, small, lovely carriage. Very easy for people to see, the passengers can sit up quite high – so there's lots of visibility for everybody."

Harry and Meghan’s wedding day- May 19- is forecast to be bright and sunny. However, if rain prevails, the couple will travel in a closed-top back-up carriage, the Scottish State Coach, with a partial glass roof instead.

For those who want to see the bride and groom up close and personal but are unable to make it to Windsor, Sky News will be broadcasting the ceremony in ultra-high definition. However, viewers will need a 4K television, which shows four times the detail of high-definition telly, to watch the event in crystal clear detail.

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Only one press reporter will be allowed inside the ceremony and four photojournalists will be given spots outside the chapel, a palace spokesman said, adding that the space is small and the wedding is not a formal state occasion.

In other royal news, British monarch Queen Elizabeth II met her great-grandchild Prince Louis for the first time on Tuesday after flying in via helicopter from Windsor Castle to Kensington Palace.

Louis, who is the third child of the Duke and Duchess of Cambridge, was born in London last week.

The newest royal is the fifth-in-line to the throne behind his brother George, 4 and his sister Charlotte, who celebrated her third birthday on Wednesday.