Princess Eugenie and Jack Brooksbank (Ian West/PA)

Royal Weddings

Royal nuptials: Princess Eugenie and fiance Jack Brooksbank gearing up for #royalwedding2

800 guests are expected to see the bride and groom marry

British Princess Eugenie will soon wed her fiance Jack Brooksbank – the latest grandchild of Queen Elizabeth II to marry their long-term partner.

Eugenie and Jack may not be household names like the Duke and Duchess of Sussex who married in May, but their big day will be just as important to the British monarchy.

At its heart, the wedding will be a happy family event with the proud parents the Duke and Duchess of York watching as their daughter marries.

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But the world will be watching the occasion, eager to see the bride and groom, the royal women – from the Queen to the Duchess of Cambridge – and the pomp and pageantry of the day.

Eugenie has already spoken of her nerves ahead of the royal nuptials and how the day will be an “anti-plastic” wedding.

Read more: Princess Eugenie's 'plastic free' wedding: Royal reveals details of upcoming nuptials in September issue of Vogue

She said in a recent interview: “It’s very nerve-wracking because you want it to be perfect but then you realise that you’re going to be with the person you love forever and nothing else really matters.”

Some details have been released about the wedding ceremony which will take place on the 12th of October in the medieval surroundings of St George’s Chapel at Windsor Castle, where British royalty have married for decades.

The Dean of Windsor, David Conner, will marry the couple while the Archbishop of York, John Sentamu, will lead the prayers. It has been reported that 800 guests will be at the wedding service.

Like Meghan and Harry’s wedding, also staged at St George’s, 1,200 members of the public have been invited into the castle grounds to enjoy the occasion, and it is likely the service will be broadcast live to the lucky group.

Related: Princess Eugenie has chosen a 'British-based' designer for her wedding dress - 'It was the one thing I was really decisive about'

Buckingham Palace said they had received more than 100,000 applications from members of the public wanting to share in the couple’s big day.

There may be a few famous faces among the guests from singer Ellie Goulding and model Cara Delevingne, to the children of Sir Richard Branson, Holly and Sam, who are all friends of the princess.

Harry’s former girlfriends, Chelsy Davy and Cressida Bonas, are also likely to attend as they know the bride-to-be well.

Eugenie’s sister Princess Beatrice is likely to be the maid of honour and the Duke and Duchess of Cambridge’s children, Prince George and Princess Charlotte, are expected to be among the pageboys and bridesmaids.

Related: Princess Eugenie's wedding dress: 10 designers in the running for the royal commission

Mr Brooksbank’s younger brother Tom is reportedly his best man while the Queen’s party planner and cousin Lady Elizabeth Anson is said to be helping the bride and her mother Sarah, Duchess of York, prepare for the big day.

After the service the newlyweds will ride in a carriage through the streets of Windsor as Harry and Meghan did, but their route will not be as long.

Crowds are expected to watch the couple as they travel along Castle Hill, High Street and Park Street.

The Queen is expected to host a wedding reception for her granddaughter at Windsor Castle and it has been reported the evening celebrations will be staged at Royal Lodge in Windsor Great Park.

The property is the family home of Andrew and his ex-wife Sarah, who remain close despite being divorced.

Related: China collection marking Princess Eugenie’s wedding unveiled - but how does it compare to Harry and Meghan's?

The cost to the British taxpayer of the royal nuptials has been criticised by Republic, a campaigning group working for an elected head of state.

Republic claims estimates have put the security costs alone at £2 million for the event.

A spokesman for the organisation added: “Public services are being cut, and councils are struggling. Why are we footing the wedding bills for the richest family in the country?

“Republic is calling on MPs to disclose the full costs of the royal wedding, and to insist the royals pay the bill.”