Prince Charles clearly doesn't want to talk about his 'black spider' memos to ministers, which are about to be released, after his aide was filmed body blocking a reporter who tried to ambush to ask about the secret letters.
The memos, written to various government departments between 2004 and 2005, will be released at 4pm after a 10-year legal battle by The Guardian.
They are understood to show Charles' disagreeing with government policy.
As Charles arrived at Marks and Spencer's flagship store near Marble Arch on Oxford Street in London, Channel 4 News' Michael Crick asked if he was "worried" about the letters and if he was still writing to ministers - and whether he thought he was behaving "unconstitutionally" in doing so.
Crick tried to accost him as he walked with his entourage but his aide forcefully held him back and ripped the muffler from his microphone.
Prince Charles refuses to tell me whether he's still writing letters to ministers. Video to follow, including aide grabbing my microphone— Michael Crick (@MichaelLCrick) May 13, 2015ADVERTISEMENT
The heir to the throne, who was at the store to highlight the Make Your Mark four-week work placement scheme between M&S and his Prince's Trust, did not reply to the questions but said "very predictable" as he entered the store.
Crick did not get an answer to his question but earned high praise on Twitter for his chutpza.
Michael Crick and the Chanel 4 News team are simply brilliant. But check out Charles's sinister aid 😂😂😂😂😂 https://t.co/NxZsFXyYGf— Teresa McMahon (@teresamcmahon4) May 13, 2015
@MichaelLCrick we need more journalists prepared to do this rather than forelock tugging subservience.— Lime Poppy (@Limepoppy) May 13, 2015
Guido Fawkes identified the woman who body blocked Crick as Kristina Kyriacou, who is reportedly nicknamed "The Colonel".
The Prince of Wales has faced accusations in the past of "meddling" in day-to-day politics.
He has been criticised for the "black spider memos" - the name given to the handwritten letters he pens to government ministers expressing his views.
The government felt the risk to Charles' ability to be monarch - who must remain neutral - was so great it intervened to prevent the letters being published.
Using his ministerial veto to block the letters' release, Attorney General Dominic Grieve said the public could interpret them as showing Charles to be 'disagreeing with government policy'.
He this perception "would be seriously damaging to his role as future monarch because, if he forfeits his position of political neutrality as heir to the throne, he cannot easily recover it when he is king''.
Crick has earned a reputation for his confrontations with various public figures as they walk in and out of places.
In 2013, he angered then Ukip MEP Godfrey Bloom so much that the politician thwacked Crick over the head with a copy of the party's manifesto. Crick had asked him why it showed only white people.
He also appeared to have annoyed Lib Dem MP Alistair Carmichael earlier today, while asking him why he would not stand for the leadership of his party.
Alistair Carmichael on why he's not standing for Lib Dem leadership: "Cos it means I don't have to deal with bastards like you every day!"— Michael Crick (@MichaelLCrick) May 13, 2015