Why Britain would keep SSNs and SSBNs

Should Britain trade SSNs for conventional submarines and remove SSBNs to fund a surface fleet like Japan's?

No. Britain's global geography favours SSNs, and recent security experience argues against surrendering the submarine nuclear deterrent.

Britain's distant commitments in the high Arctic and the Falklands are the reason given for retaining nuclear attack submarines. Japan's conventional submarines suit a different mission centred on protecting Japan and its sea lines of communication. The answer also favours retaining ballistic-missile submarines because of the security risks associated with giving up a nuclear deterrent. A second response combines strong opposition to nuclear weapons, intensified by visiting Hiroshima, with support for retaining a deterrent against other nuclear powers.