A fascinating thread, may I thank the participants for their recollections of a chilling part of our history please?
If you are interested in target philosophy, may I recommend 'the silent deep' just published by Hennessey. Its a history of the Cold War UK Submarine Service, but has a long section on deterrence including a memo from the 1970s on what effects the deterrent was intended to achieve and how this could be done. It lays out in some detail the options open to the UK at the time, and what effects could be gained from different options and why.
Its a chilling piece of staffwork, and well worth reading as part of an excellent wider book.