Brexit supporters descended on Parliament Square early on Thursday to place 34 Union flags in a spot usually occupied by EU flags before Remain voters arrived.
David Ireland, 41, and three others arrived at around 6am armed with the custom-made flags to find no EU ones there.
They swiftly moved to set up all 34 around the television cameras outside the Houses of Parliament.
It is just the latest skirmish in a battle which means a lot to the people who take part, but is just deeply embarrassing for everyone else.
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The Remain campaigners arrived at 7.30am, and began placing their EU flags around the Union flags.
Mr Ireland said: "People turn on the TV and see this entire wall covered in EU flags; some people want to be in the EU but there's also some people who don't want to be in the EU, so we've come along and done our flags.
"What the Remain voters do is shun all the Leave campaigners into the irrelevant middle ground and dominate the TV space.
"The narrative was this is the EU zone, we own this, but it seemed a little bit one-sided."
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Campaigners on both sides believe being visible in the background of TV broadcasts is important.
It is not immediately clear why.
Asked if he would do the same on Friday, Mr Ireland said: "I've got a job, I can't do this all the time like they do."
