Similar bacteria were released in 'The Sabotage Trials' between 1952 and 1964. These were tests to determine the vulnerability of large government buildings and public transport to attack. In 1956 bacteria were released on the London Underground at lunchtime along the Northern Line between Colliers Wood and Tooting Broadway. The results show that the organism dispersed about 10 miles. Similar tests were conducted in tunnels running under government buildings in Whitehall.

Experiments conducted between 1964 and 1973 involved attaching germs to the threads of spiders' webs in boxes to test how the germs would survive in different environments. These tests were carried out in a dozen locations across the country, including London's West End, Southampton and Swindon. The report also gives details of more than a dozen smaller field trials between 1968 and 1977.