From a UK perspective, the SNP (the Scottish Nationalist Party) who have a majority in the part of the world Hadrian threw away are inherently anti nuclear.
In the rest of the UK, the nuclear deterrent is a bi-partisan affair - when Polaris was acquired, both sides of the house were consulted and everyone involved apart from a few gibbering half wits agreed that structurally they were in bed with the idea.
So, Conservatives (Blue ties) and Labour (Red ties) are both broadly committed to a nuclear deterrent. The Lib-Dem's aren't but since no-one will ever vote for them ever again after the current coalition, it's not a big deal.
In terms of the population, there are large chunks of the country with low employment that are supported by the deterrent in various ways and I think as a nation, after almost a generation of continued commitment to international deployment, there's a broad sense that we do our bit, we at a grass roots level support our armed forces more than ever and that a nuclear deterrent is a chunk of that process.
Guardian readers may differ in a squeaky way but ah...f*ck 'em.
(I'm not trying to take this to a political discussion, just summarising the dimensions other than military in the equation!)
At the moment the money is being distributed in a series of fairly forward thinking measures (the steel for the entire successor fleet was bought two years ago for instance, money was allocated for the PWR3 reactor earlier this year, now we're into sub design)
There's no broad movement to terminate the nuclear deterrent - I think there might be if there were a firm commitment to put that money into conventional forces but every one is way too cynical to believe that might happen. Over the life of Successor, we'll probably spend more money on foreign aid for India at the current rate we're going (India having it's own space program, nuclear weapons program etc, hence my reason for singling it out)
Better yet, Successor keeps the nuclear infrastructure primed and in operation to keep building nuclear attack boats in the future (I know you know this GF, apols for appearing to do an "as you know" speech)
That's the 1 minute whistle stop tour of where we are according to me, corrections anticipated and accepted.
Ian