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Of course, it's likely they simply overlaid one message over the other - the result did come in at the weekend, of course - but with a bit of photo editing wizardry you can just about make out a word that seems to be 'Trump' and some bits that could read 'second term'.
The smaller font size of the hidden message suggests that they actually prepared a longer message for Trump and his running partner Mike Pence.
Can we read anything significant into that? Perhaps not. However, it does seem a little bit like they couldn't be bothered making up two images.
The actual message that was tweeted out reads: "Congratulations to Joe Biden on his election as President of the United States and to Kamala Harris on her historic achievement.
"The US is our most important ally and I look forward to working closely together on our shared priorities, from climate change to trade and security."
It is signed: "Prime Minister Boris Johnson."
This message was tweeted out at 5.49pm on British time, which is over an hour after the results of the election were out.
Maybe they just had to tweak some images, right?
If you're any good at doing this sort of thing, you can probably work out more of it, given the time and effort.
A Government spokesperson told LADbible: "As you'd expect, two statements were prepared in advance for the outcome of this closely contested election. A technical error meant that parts of the alternative message were embedded in the background of the graphic."
Johnson was just one of a long line of world leaders queuing up to congratulate Biden and Harris - who becomes the first woman of colour, and first Asian American to become Vice President - on their historic victory.
France's President Emmanuel Macron tweeted: "The Americans have chosen their President. Congratulations Joe Biden and Kamala Harris!
"We have a lot to do to overcome today's challenges. Let's work together!"
Canada's Prime Minister Justin Trudeau added his good wishes, writing: "On behalf of the Government of Canada, I congratulate Joe Biden and Kamala Harris on their election as the next President and Vice President of the United States of America.
"Canada and the United States enjoy an extraordinary relationship - one that is unique on the world stage."
Germany's Chancellor Angela Merkel said: "The United States of America and Germany as part of the European Union must stand together to deal with the great challenges of our time,
"Side by side in the difficult test of the corona pandemic, side by side in the fight against global warming and its global consequences, [and] in the fight against terrorism, side by side for an open world economy and free trade, because those are the foundations of our prosperity on both sides of the Atlantic."
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