RN7, that's a cracking piece of analysis - very, very well done.
One minor point - the UK does have one onshore oil field, which is operated by BP and located at Wytch Farm in Dorset (relatively close to Bovington Camp).
http://en.wikipedia.org/wiki/Wytch_Farm
Also, and again from a local point of view (I grew up about five miles from Rosyth) the nuclear deterrent was based on the Clyde - the subs themeselves were (indeed still are) at Faslane, whilst warheads were kept at Royal Naval Armaments Depot (RNAD) Coulport, approx ten miles away. The US Navy had a separate facility at Holy Loch which was closed in 1992 IRL.
The Subs did go to Rosyth for any refitting that was required until the mid 1990's IRL (when the work moved to Devonport, but that's a whole other story...)
Also, you may want to include Boscombe Down in the list of air bases in South West England (I did have a look, and didn't see it mentioned, although I may have missed it)
http://en.wikipedia.org/wiki/MoD_Boscombe_Down
Like Tigger said, please don't take any of that as a criticism - I genuinely think what you've put together is an oustanding piece of work - well done.