Millions were in germ war tests http://www.guardian.co.uk/politics/2002/apr/21/uk.medicalscience

The Ministry of Defence turned large parts of the country into a giant laboratory to conduct a series of secret germ warfare tests on the public. A government report just released provides for the first time a comprehensive official history of Britain's biological weapons trials between 1940 and 1979. 

Many of these tests involved releasing potentially dangerous chemicals and micro-organisms over vast swaths of the population without the public being told. While details of some secret trials have emerged in recent years, the 60-page report reveals new information about more than 100 covert experiments.