A billboard in London is displaying a blown-up image of a 2015 tweet by David Cameron, promising "stability and strong Government".
The tweet was sent on 3 May 2015, 4 days before the general election that saw the Conservatives win an outright majority, and reads: "Britain faces a simple and inescapable choice - stability and strong Government with me, or chaos with Ed Miliband".
Just over a year later, on 24 June 2016, Mr Cameron resigned after the result of the Brexit referendum, saying: "I was absolutely clear about my belief that Britain is stronger, safer and better off inside the EU. I made clear the referendum was about this, and this alone, not the future of any single politician, including myself.
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"But the British people made a different decision to take a different path. As such I think the country requires fresh leadership to take it in this direction."
The tweet is on a billboard on Manor Road in Stoke Newington, London.
A Twitter account created in December 2018 with the handle Led By Donkeys appears to be that of the people behind the billboard.
On Wednesday morning it tweeted: "Last night we started a little project to record for posterity the prophetic words of our leaders. Here’s the first one (Manor Rd / A10 in London). Eyes peeled for more #LedByDonkeys #TweetsYouCantDelete @David_Cameron @Ed_Miliband".
They also ask followers for suggestions of other tweets by politicians that they should use, and where to display them.
Primesight, who own the billboard, said the advertising space had not been purchased from them, meaning the tweet was illegally flyposted.
talkRADIO has contacted Led By Donkeys for comment.