-Cosmic RoyThat's right. I glanced at it most casually, and knew in an instant. But for the benefit of other readers... why?
Well, actually I find myself now doubting what I said.
The twin Hispano cannon + 4x .303 machine gun arrangement first appeared in the Mk2b, which did go into service in late 1940. My first look at the attached image made me think it had the six exhaust arrangement typical of a Mk.IX , or at least a Mk.V which was a 1941 arrival.
I still think it is, but on blowing up the image it's actually less certain.
If I had to put money on it though, I'd say Mk.V and the fact that 303 squadron got them in 1941 supports this.
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