Prototype will not release in the UK on June 9 with the rest of Europe, but will instead grace its shores on June 12.
Proof is in the press release posted below.
Activision Publishing today confirmed that Prototype, the action game developed by Radical Entertainment. for PC, X360 and PS3, will hit the store shelves in the UK on June 12. Prototype is a new open-world game which tells the story of Alex Mercer, a man haunted by his past, fighting a secret war in New York City. As the action spirals out of control, a conspiracy tied to his origins threatens the future of mankind itself. Mercer's amazing shapeshifting powers allow him to become an exact replica and steal the skills or powers of anyone who crosses his path. Prototype will be availale on June 5 in the rest of Europe and on June 9 across North America.