When the Navys deterrent weapon is 50 miles from is target, can it be recalled if a breakthrough is reached?
You would seem to miss the point of deterance. If the missles are launched then the subs mission is a failure. The point is Russia, China or any other country with Nuclear weapons will not launch at the UK because the UK will then fire back and remove said country from the face of the earth hence they won't dare!
Also once the V-Force passed the Go-No Go line after recieving the go code they would not turn back no matter what radio messages were recieved. So you can't re call a bomber either.