This article in the Belfast Telegraph cited BASIC Executive Director Paul Ingram talking about the costs of Trident.
Read the full article here: http://www.belfasttelegraph.co.uk/news/general-election-2015/trident-debate-16000-nuclear-missiles-in-the-world-but-who-has-them-and-does-uk-really-need-its-own-arsenal-31130413.html