The Queen is likely to decide on the day whether she will make appearances at her Platinum Jubilee celebrations next month.
The 96-year-old monarch has been suffering from mobility issues recently that have forced her to pull out of several key engagements.
Over the course of the Jubilee weekend, she is expected to appear at Trooping the Colour on the Thursday, a church service at St Pauls's Cathedral on the Friday and at the Epsom Derby on the Friday.
However, decisions on her appearances across the weekend are not likely to be confirmed until the day.
A Palace spokesman said: “The Queen is looking forward to the weekend and will be taking part in the celebrations but her presence will not be confirmed until much nearer the time or even on the day itself.”
With less than a month to go, the Palace has released further details, including how Jubilee arrangements have been tailored for the Queen’s comfort.
The Queen is expected to travel by car to the national service of thanksgiving celebrating the Platinum Jubilee and dispense with ceremonial elements like a coach to ensure her comfort.
St Paul’s Cathedral will host the service on the second day of the extended Bank Holiday weekend marking the 70-year reign of the Queen, who will not arrive by the Great West Door, at the top of a flight of steps, but by another entrance.
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The changes mirror arrangements made for the monarch, who has mobility issues and sometimes walks with the aid of a stick, for events at Westminster Abbey where she has arrived via a door that shortens the distance to her seat.
A Buckingham Palace spokesperson said: “As you might expect, some adjustments have been made for the Queen’s comfort.
“There will be no ceremonial journey to St Paul’s and Her Majesty is expected to arrive at a different entrance than on previous occasions.”
The service will see one of the country’s largest bells, the Great Paul, rung during the service, the first time it will have been heard on a royal occasion.
The event will feature a new anthem by Judith Weir, Master of the Queen’s Music, that sets to music words from the third Chapter of the Book of Proverbs.
Bible readings, hymns and prayers to express thankfulness for the Queen’s reign, faith and service will also be heard by the congregation as the nation marks the monarch’s 70 years on the throne.
The Dean of St Paul’s, the Very Reverend Dr David Ison, said: “It is a great honour to hold a service of thanksgiving for the reign of Her Majesty the Queen and to celebrate her 70 years of service to the UK and the Commonwealth.
“We are also delighted to open a brand new exhibition documenting previous Jubilee celebrations across three centuries.
“From rich and beautiful textiles to treasured photographs and scrapbooks, the story emerges of the excitement and anticipation of each Jubilee celebration, and the unique role that St Paul’s holds in ceremonial occasions.”
