MB
1) Yes they can be fitted with the GAU-22/A cannon pod
2) No, the UK didn't buy any because
- We are not going to get into dogfights 'we don't need to go there because we will make sure we play to our advantages and not theirs.' (said Air Cdre X)
- It's an air to ground weapon
Obviously, they aren't going to go anywhere there are drones unless there are so few the pilots don't run out of AAMs, its up to the ship's area air defence missiles and CIWSs. And the ROE will absolutely not require visual confirmation.
Any Vietnam era F-4 pilots/WSOs/RIOs wish to disabuse them?