Just to clarify. While the Vc could carry 4 20mms I've only found one instance where they did operationally and it was purely ground attack, not air to air.
The Malta Vcs that launched with 4 cannon had two removed as soon as they arrived to save weight and improve climb and maneuverability.
A clipped, clapped and cropped Spit Vc would be nice, but with the Spits we have, I think we're doing fine.
Better to wish for a Seafire III
And yeah I'd love a Griffon Spit XII but I can get by without it