Sharon Ament, the London Museum's director, said the "only thing better than having a Banksy appear on the walls… is having a Banksy on display inside."

In August 2024 the biting satirist claimed responsibility for turning a 1990s police sentry box on Ludgate Hill into a vicious-looking aquarium, using translucent spray paint. It was part of a spate of critter-themed artworks that Banksy delighted London with, others including a gorilla at London Zoo and a pelican outside a Walthamstow chip shop.

Banksy's piranhas artwork will go on permanent public display next year at London Museum, when it opens its new premises in Smithfield. Featuring the fierce fish making an aquarium out of a police sentry box,