"Do you really believe our Nuclear Deterrent is independant? It's not."
In my experience, anyone who feels they can make assertions such as this has not actually been fully briefed in to, or been part of, the nuclear firing chain.
It is telling that in 48 years of deterrent operations, to my knowledge not one former RN submariner who has actually had the mission of deterrence and delivering the Polaris or Trident system has ever come forward to dispute the 'independent' claim.