HC Deb 12 March 1981 vol 1000 c397W
Mr. Michael McNair-Wilson

asked the Secretary of State for Defence when preliminary design work on the warhead for the Trident missile first started at the Atomic Weapons Research Establishment, Aldermaston.

Mr. Speed

The design stage for the Trident warhead programme has not yet been reached. At the moment we are assessing design options on the basis of both our own information and information we are receiving from the United States.