“I don't know by whom we might be threatened. What I do know is a government [sic] we have to be prepared for any eventuality, and I do know that possessions of those nuclear weapons has kept the peace between nuclear powers far better than the possession of conventional weapons did. You know when we only had conventional weapons Europe was at war again with 21–22 years. We have had 38 years peace and in another four or five years we will have the longest period of peace in Europe for centuries. That, to me, is the greatest prize of all, and…I'm prepared to allocate that expenditure to keep peace for the people for whom I'm responsible.”
TV Interview for Granada TV (1 June 1983) http://www.margaretthatcher.org/document/105096
First term as Prime Minister
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Margaret Thatcher 348
British stateswoman and politician 1925–2013Related quotes

Statement of 1973, as quoted in Canadian and World Politics (2005) by John Ruypers, Marion Austin, Patrick Carter, and Terry G. Murphy
1970s

Jeremy Corbyn row after 'I'd not fire nuclear weapons' comment https://www.bbc.co.uk/news/uk-politics-34399565, BBC News, 30 September 2015
2010s, 2015

Meet The Press with Tim Russert. http://msnbc.msn.com/id/3080244/ (Sept. 14, 2003)
2000s, 2003

Speech to Conservative Party Conference (12 October 1984) http://www.margaretthatcher.org/document/105763
Second term as Prime Minister

Interview (18 December 1997) http://www2.gwu.edu/~nsarchiv/coldwar/interviews/episode-21/turner1.html for CNN : Cold War. Episode 21 : Spies (14 March 1999)
1990s
Context: America and Russia have excessive numbers of nuclear weapons today because we treated nuclear weapons, at the end of World War II, like they were just bigger conventional weapons. If you have tanks, and the other side has more than you, you may be in trouble — or airplanes or ships or whatever. With nuclear weapons, it's not the same: they're too powerful, and at some point you just can't use any more, it's just not meaningful. But what happened was, we had the lead of course, because we invented them. The Russians tried to catch up with us; we tried to stay ahead of the Russians; they tried to catch up with us, and we just had a never-ending race upward. By the mid-Sixties, we realized this, but because of the Cold War mentality, politicians couldn't stand up and say, "I'm willing to have less than the Soviet Union," and so the race continued, but we tried to mitigate it by instituting an arms control process, which at first tried to cap and then later to reduce these numbers. … there's just no way you can actually use them; they become so destructive. I estimate that a couple of hundred nuclear weapons, not just on the center of cities, but on economic positions in the country, will drive a country to the point it will never recover, it will never be the same again. It will survive, but it'll be a totally different country. You don't need thousands to do that. There are only a few hundred cities of any size in even Russia or the United States, like 200, and you just don't need thousands of weapons to demobilize a country.

Prime Minister's Questions (15 June 1982) http://www.margaretthatcher.org/document/104968
First term as Prime Minister

The London Standard (30 September 1986).
1980s