It not only implicitly addressed the drawbacks of Blue Streak in that it was not vulnerable to a pre-emptive nuclear strike .
It not only implicitly invoked the traditional role of the Royal Navy , and its second - strike capability made it a more credible deterrent .
It not only implicitly addressed the drawbacks of Blue Streak in that it was not vulnerable to a pre-emptive nuclear strike , but invoked the traditional role of the Royal Navy , and its second - strike capability made it a more credible deterrent .