The Spit 5 inner .303 is in the wrong position.
If you take a Spit I 'A' wing and number the .303s outboard to inboard as 1,2,3,4.
The V's .303s should be in postions 1 and 2. (same as the VIII and IX).
It appears that they are actually in position 1 and 3 on the Vb.
Only found it when I was doing a Vb skin, and noticed the difference in position of the inner red gun port patches compared to the IX and VIII.