British actor Orlando Bloom finds performing on London's West End stage daunting compared to starring on a multi-million dollar movie set. The Pirates of the Caribbean star makes his West End theatre debut in London on 16 July (07) in a revival of David Storey's 1969 play In Celebration - and Bloom admits he is petrified. He says, "Theatre acting is just a different muscle, and I'm sort of shocking it into life. "Right now, I'm finding rehearsal space where we're working a very intimidating place, much more so than any $300 million movie set."