 the united kingdom possesses, or has possessed, a variety of weapons of mass destruction, including nuclear, biological, and chemical weapons. the united kingdom is one of the five official nuclear weapon states under the nuclear non-proliferation treaty and has an independent nuclear deterrent. the uk has been estimated to have a stockpile of approximately 160 active nuclear warheads and 225 nuclear warheads in total.status of world nuclear forces federation of american scientists it had renounced the use of chemical and biological weapons in 1956 and subsequently destroyed its general stocks. ==biological weapons==  one of the well-known recorded incidents of biological warfare by the british was during pontiac's rebellion (1763-1766). in june 1763, the british army approved the use of smallpox using blankets during their meeting with the besieging native americans at fort pitt in a desperate attempt to drive them out. during the meeting with the native americans at fort pitt, british officers infected them with blankets filled with smallpox, hoping "to inoculate the bastards with some blankets that may fall into their hands". this attempt was successful and smallpox that started by the british at fort pitt spread into other areas, killing between 400,000-500,000 (possibly up to 1.5 million) native american indians - men, women, and children - during and years after the war.crawford, native americans of the pontiac's war, 245â250{{cite book |title=handbook of chemical and biological warfare agents |author=d. hank ellison |date=august 24, 2007 |page=123-140 |p
Military_of_the_United_Kingdom Weapons_of_mass_destruction_by_country