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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.
That would have been more appropriate
I suppose it draws attention away from the V2 rocket which is on permanent display at London Bridge Station