It wouldn't take all that many weapons to 'neutralise' most European neutrals - a bomb on the capital and the biggest couple of administrative centres, make them ground bursts to spread fall-out. Although they can't hit back if they survive intact they could potentially become a threat in the post-war period; at least that would be the thinking amongst the strategic planners. Throw two, or three bombs each at them and they'll be too busy rebuilding like everyone else. Taking the Republic of Ireland with limited numbers of weapons I'd go for Dublin (which was included in a British civil defence exercise), the Curragh, Knock and Shannon Airports and Cork. A small targeting plan like that will take out the Irish government, the majority of their army and potentially deny two big airports and a major port to NATO. Even if the Republic survives relatively unscathed I doubt there will be much for them to take over in the North - Belfast will be gone, ditto Londonderry/Derry, even if it is only because the Soviets go for nearby Shackleton Barracks. The biggest army bases in NI will probably be targeted. Taking out Argentina could be done either by Polaris, or by arming the Phantoms based at RAF Stanley/RAF Mount Pleasant (if 1985, or later) with WE.177 gravity bombs. Once the missiles start flying all the political constrains about using nuclear weapons go out of the window - if your homeland is about to be reduced to twelve irradiated fiefdoms, then blowing up a non-nuclear country because they are about to invade a bit of your territory which will probably survive is a given. IIRC the British garrison in the Falklands around '83/84 is pretty strong. The RAF has both Phantoms and Harrier GR.3s down there, while the army has at least a battalion group including artillery and engineers. There was also a company from the resident battalion on South Georgia. Conversely the Argentineans have not yet recovered from the war and are in no real condition to invade anywhere.