UK Nuclear options – post Scottish independence

Assuming that Scotland decides to leave the UK – what are the options for the continuing nuclear deterrent?

It seems to me that on the one hand, a loud voice for nuclear disarmament would be gone (the SNP), but the rUK would be faced with having to rebuild a lot of infrastructure to support the Vanguard class submarines and their successors, presumably at one of their bases on the south coast of England. The great expense of this and the inevitable NIMBY outcry leads me to believe that this might spell the end of the nuclear deterrent for the UK, at least in this form.

So what are the options? As I see them we have:

A) Disarm
B) Switch to nuclear tipped cruise missiles on other ships/submarines
C) Switch to an air delivered deterrent, eg. B61/ ASMP-N
D) Continue with current system, but rebuild infrastructure.

Of all of these the air delivered deterrent is by far the quickest, easiest and cheapest option – so could we in fact see a return to an RAF/FAA based nuclear deterrent? Discuss.