The 20-foot Christmas trees, felled from Windsor Great Park, have been decorated with red and blue baubles as well as fairy lights.
This Christmas will be Charles’s first as King following the late Queen’s death in September.
He is to spend Christmas Day at Sandringham this year, Buckingham Palace said today.
King Charles appears to be getting into the festive spirit with just a month to go until Christmas
Charles will travel to the private Norfolk estate, where Queen Elizabeth II traditionally hosted her family over the festive period.
He is also expected to give his first Christmas broadcast, a royal tradition started by King George V.
Royal expert Jennie Bond said Christmas will be “less formal” with the new King.
The former royal correspondent added that it will be “full of nostalgia and some good measure of sadness” for the late Queen.
A Christmas tree in St George’s Hall
Another impressive Christmas tree is on display in the Crimson Drawing Room
“It’s always a sad time when you have your first Christmas without the main person.
“Like every other family, they will get used to it but it’ll be slightly different.”
Ms Bond added that Charles’s Christmas message is “bound to have some reflection on their loss”.
Staff decorate the 20-foot Christmas tree
The finishing touches are added to a Christmas tree
ITV said the event will honour the values Queen Elizabeth II demonstrated throughout her life including “empathy, compassion and support for others”.
The broadcaster said the carol service will recognise and celebrate “the selfless efforts” of those across the UK and highlight “the remarkable impact that coming together to support others can have for us all”.
ITV added it will “celebrate and showcase the joy that human connection can bring, forging friendships and strengthening communities, creating legacies of humility and kindness, whilst also providing relief and comfort in times of difficulty or loss”.
Source: EXPRESS CO UK