Brits up and down the country have tuned in today to watch the Queen's Platinum Jubilee Pageant on the final day of celebrations marking Her Majesty's 70-year reign.
But some viewers were left feeling baffled and outraged after spotting an alleged "Nazi symbol" on the side of one of the floats in the parade.
The float, which was intended to explore the Northern Soul movement from the 1960s, featured an image of a black and silver wheel with jagged lines.
Many have compared this to the "Black Sun symbol", which was associated with Nazi Germany and later neo-Nazis.
The design of the Black Sun features a sun wheel with 12 radial sig runes.
Twitter users branded the inclusion of the symbol in the Pageant "poor judgement" and demanded answers as to how it ended up there.
"Why's the black sun on the northern soul float at the Jubilee parade," asked one person.
Another said: "I'm guessing they Google image searched Northern Soul images... but that one... that's not a Northern Soul symbol mate, it's a WW2 Nazi badge."
A third posted: "Um. This... this is a Nazi symbol. Is this real? WTF happened?"
Someone else said: "Nazi symbol on the Northern Soul float? The same Northern Soul that celebrated Black American Soul Music? I hope it was done by someone who didn't have a clue and just liked the pattern."
Others pointed out that the image does come up as a stock image on sites such as Alamy when you searched for the words ''Northern Soul'.
"If you search 'northern soul images' on Google it comes up on a few stock image sites - I'm guessing whoever got the job of dressing the float didn't double-check," added a different user.
The Platinum Jubilee Pageant Company has since apologised for any offence the symbol has caused.
They told The Mirror: "This is a genuine mistake and we apologise for the offence caused. The act intended to represent the Twisted Wheel Club associated with Northern Soul music from 60s and 70s, and the symbol was unfortunately mislabeled on search engines.
"This is an error with no malicious intent. Anyone who has seen the Pageant will know that the Pageant is all about inclusivity, tolerance and unity and this symbol does not correlate with anything it stands for."
