The walk yesterday was challenging,” William said, according to Wells.
“I said how proud his mother would have been of him, and he said how hard it was yesterday because it brought back memories of his mother’s funeral,” Wells told reporters afterward.
Sandringham is the monarch's privately-owned retreat a few hours by train northeast of London. It's where the late queen spent some of her childhood years and where she presided over many Christmas family gatherings.
Buckingham Palace announces nationwide moment of silence
Buckingham Palace has announced that two minutes of silence will be observed across the United Kingdom at the end of Queen Elizabeth II’s state funeral.
The funeral is to be held at Westminster Abbey on Monday, with some 2,000 guests attending, including visiting heads of state and other dignitaries on Monday.
The guest list for the state funeral is a roll-call of global power and pomp, from Japan’s Emperor Naruhito and King Felipe VI of Spain to U.S. President Joe Biden, French President Emmanuel Macron and the prime ministers of Canada, Australia and New Zealand.
After the funeral, the late queen’s coffin will be transported through the historic heart of London on a horse-drawn gun carriage.
It will then be taken in a hearse to Windsor, where the queen will be interred alongside her late husband, Prince Philip, who died last year.

Contributing: Elise Brisco, Nicole Fallert, Maria Puente and Associated Press