THE King and Prince William today surprised mourners waiting in the five-mile queue to see the Queen lying in state.
Crowds cheered as the Monarch and his son arrived to thank people for waiting up to 26 hours to pay their respects to Her Majesty at Westminster Hall.
Hundreds of royal fans in line in Lambeth, South London, applauded as Charles, 73, and William, 40, emerged together.
Many took photos and pressed against the metal barriers, eager to exchange a word with the pair.
The father and son shook hands with those closest and smiled and waved at those in the back.
Several shouted "God Save the King" and "God Save the Prince of Wales" as they passed by.
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One person told Wills: "You'll be a brilliant king one day", before he said to another: "It really means a lot that you're here."
And at one point, he warned royal fans "it's very emotional when you get in there" as he prepped them for stepping foot inside the Palace.
One woman offered His Majesty condolences as he held her hand, and another cried out: "I can't believe this."
Dozens bellowed "hip hip hooray" as the duo moved down the pavement, stopping for a few moments with each person.
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Several people could be seen calling their friends and relatives on the phone to tell them what they had just witnessed.
There was a sea of phones trying to snap a photo of one of the royals on the impromptu walkabout, but their security guards encouraged people to "enjoy the moment".
It comes as...
- Camilla reveals the royals are ‘exhausted’ but carrying on as ‘stopping would be worse’
- It's confirmed Prince William will lead the Queen's grandchildren at a poignant vigil at her coffin tonight
- Harry will wear his uniform after being granted special permission by the King
- The list of 500 heads of state and dignitaries attending the Queen's funeral is revealed
- Thousands faced a 25-hour wait to see the late monarch lying in state
- A man is tackled to the ground after grabbing the flag at Westminster Hall
- Sophie Wessex is reportedly set to take on a number of the Queen's old roles
- A minute-by-minute guide on the Queen's funeral details is released
Wait times stretched to more than 25 hours overnight as thousands braved cold temperatures to see the Queen lying-in-state.
The Department for Digital, Culture, Media and Sport's (DCMS) then warned mourners not to make the journey until further notice as Southwark Park was "near total capacity".
The gates reopened at around 9am, but those already in line were urged to brace for cold weather, as temperatures dipped below 7C in the early morning.
Undeterred, a steady stream of people joined the queue, many wearing coats and jumpers.
Tatie Kirst, 38, a project manager who had just joined the back, said: "I think I'm prepared, I brought my good coat, I have a stool if I need to sit, I'm getting food and water, and we're going to walk the way.
"I think there is always a question, Is it worth it? Can I make it? And hopefully, yes.
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"I wanted to be part of this, pay my respect to the Queen."
The DCMS is regularly updating its , and at 7pm the wait time was 12-and-a-half hours.