Hugh
I read the link you included, which is I'm sorry to say one of those smoke and mirrors things.
The Naval base exists to support the Trident and Astute Submarines, and to store conventional explosives.
Once Scotland asks for them to go, then there is no reason for the base, so everyone goes. You mention, as does the article Trident, maybe it's correct that 520 are directly employed by Trident missile tasks, but that's not the point is it, the whole base is going to close. Of the 11000 there are a huge number that don't work directly on the trident system, but are only there because the submarines are.
So everyone not directly employed by the RN, and some of the MOD civil Servants is unemployed. The trouble is CND asked the wrong question, they asked how many were employed directly on Trident as a missile. The answer they got is undoubtedly true, but isn't the number that will go if the site is closed.
Moving on, the £270 million came from a local (to CNB) web site, but doesn't surprise me. Trouble is with people who've never had anything to do with the forces, is that you have no idea how everything works round the edges of it. So, not everyone that gets posted to CNB stays behind the wire, in fact like most Military stations, almost no one does. They get paid, and that money gets spent in the local area in the main. Families shop in the local area, people drink in the local pubs. Cars are bought, and sold. Provisions for ships are often sourced locally, as is food for on shore Messes. People live in their own, and rented accommodation in the area, and pay Council tax.
Submariners on Trident spend months at sea, with nothing to spend money on. When they get back a lot of that flows into the local area.
Businesses grow up around Military bases and are dependent upon them, thats all Military Bases, not just CNB. The base goes, they go, more loss to the local economy.
Anticipating your 'oh, well the Scottish Navy will be based there!' line, the SNP say that it will consist of a couple of Frigates. your navy is going to be less than 1000 people all in. Probably a lot less. That leaves a huge black hole in the economy, which is currently the biggest single site employer in Scotland.
Read what's written, and you'll see that what Cameron said was cross checked against the reality. For once for a Politician he's told the truth.
So thats just one example of what I have been trying to say to you. The SNP are selling you a dream, if they have misled once, how many more times have they done so? Ok, you are never going to accept that, but there are seemingly a number of Scots that will fall for it, and once this vote is over they have to live with that. Once they start to find out they have been led up the garden path it's too late, hence why I think you should have negotiated first and then voted.