Effectively, is this not a step back to the 'unilateralist' days of Michael Foot's Labour Party? And what a disaster that was.
This is surely just a sop to the unions-Lets build the boats, keep the punters in a job, but then not bother with the key element of the deterrent (the warheads).
A nuclear deterrent without the 'nuclear' bit is surely as effective a deterrent as a chocolate fireguard.