HC Deb 27 April 1981 vol 3 c318W
Mr. Trippier

asked the Lord Privy Seal which countries possess the technological capability of building and detonating a nuclear device.

Mr. Hurd

The United States, USSR, United Kingdom, France, China and India have demonstrated this capability. The production of a nuclear explosive device could probably be undertaken if sufficient effort were devoted to it by any country with a developed industrial base. Most such countries have of course renounced the option.