CLIMATE protesters who slapped a waxwork of the King with cakes had earlier planned to kidnap the figure.
Tom Johnson, 29, and Eilidh McFadden, 20, wore Just Stop Oil T-shirts during the attack last October.
Both denied criminal damage but were found guilty today by Westminster JPs and must pay Madame Tussauds in London £3,500.
Johnson, of Blairgowrie, and McFadden, of Glasgow, said they had discussed removing the King’s figure.
Johnson told the court: “I'm surprised it's even been brought to this level - however, we are here.
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“I think the level of disruption and damage felt by Merlin Entertainment should be considered seeing as they are one of the largest firms in the entertainment sector; they own Legoland and Disney World, and this is really minor for them.
“When we were designing the action, we considered other actions such as holding hostage the figure of King Charles III and broadcasting his own words.
“We agreed that could've been extremely disturbing or frightening to anyone on the scene.
“So we decided to stand next to him and calmly quote his words.
“Unfortunately, the noise level in the room was quite loud and we had to shout but the substances we used were carefully chosen to cause as little damage as possible.
“We are now approaching tipping point and a point where there is little hope of a stable climate; this is huge.”
The trial continues.