Protesters have covered a portrait of the King with the face of the animated character Wallace from Wallace and Gromit.

Animal Rising shared a video of campaigners pasting Wallace’s head over Charles’s and adding a speech bubble on top of the red-hued painting by Jonathan Yeo.

The speech bubble read in capitals: “No cheese, Gromit. Look at all this cruelty on RSPCA farms!”

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The demonstration was aimed at highlighting the group’s “damning investigation” into 45 RSPCA “assured” farms, the group said.

It added that the protest was a “comic redecoration” and said the posters were affixed using water sprayed on to the back, so they could be easily removed.

It is understood the painting is behind Perspex and so no damage has occurred.

The group said the “lighthearted action played on the King’s love of Wallace and Gromit”.

The Queen once revealed that inventor Wallace and his dog Gromit – the stop-motion animation stars of hit Aardman films including The Wrong Trousers and A Grand Day Out – were her husband’s “favourite people in the world”.