While throngs of royal fans are expected to pack the streets this weekend to celebrate the Trooping the Colour ceremony, Prince Harry is expected to face a much more isolated experience across the pond.

As members of the Royal Family greet an adoring public and appear on the balcony of Buckingham Palace, Harry will be watching from afar, reminiscing about what once was.

The weekend is expected to be a “nightmare” for the estranged royal, according to royal author Tom Quinn.

“King Charles’ birthday and Father’s Day are both a nightmare for Harry,” Quinn told The Mirror.

“He knows the world will be watching to see whether he is big enough to reach out to his father. He is determined to try to ignore his troubled relationship with his father and he will certainly send a warm message.

“It’s easy to forget that Harry really does love his father, he just hates the fact that Charles seems always to support William when there is a family dispute.”

In addition to missing out on the action of this weekend’s celebrations, the historic event will likely serve as a stark reminder of what Harry gave up since stepping away from his royal duties.

“As time goes by, Harry misses some aspects of his old life in the UK,” Quinn added.

“Inevitably, the honeymoon period where everything in the States is new and exciting is coming to an end and Harry is looking back at the past through rose-tinted spectacles.

“He misses his Old Etonian and army friends, many of whom have not visited as they don’t get on with Meghan. Harry is determined to find his own permanent home in the UK, which is partly why he’s continuing his legal action to get the British taxpayer to pay for his security.”

While Harry may not be looking forward to the historic ceremony, those eager for one of the most significant events on the British royal calendar are in for a treat.

The annual military ceremony, held in London, United Kingdom, celebrates the official birthday of the British monarch and is a longstanding tradition that dates back to the 17th century.

Over 1400 parading soldiers, 200 horses and 400 musicians come together each June in a great display of military precision, horsemanship and fanfare to mark the Sovereign’s official birthday.

The streets are lined with crowds waving flags as the parade moves from Buckingham Palace and down The Mall to Horse Guard’s Parade, alongside Members of the Royal Family on horseback and in carriages.

The display closes with an RAF fly-past, watched by Members of the Royal Family from Buckingham Palace balcony.