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Assuming you mean the thing on the side of a building on Tooley Street, that's not a V2.
It was installed on the building when it contained a "space launch experience simulator" in the late 80s and early 90s. It was supposed to look a bit like a Saturn V.
Eventually, the company went under and was bought out (simulator and all) by the London Dungeon owners and converted to a "blitz experience". They just overpainted the NASA livery on the model on the building and changed the video inside the simulator.
They might have put some invasion stripes on it, in that case.