§ Mr. Livingstone
To ask the Secretary of State for Defence, pursuant to his answer of 5 July,Official Report, column 276, who was in control of the user acceptability trials with the S6 respirator; and where these trials were carried out. 
§ Mr. Arbuthnot
[holding answer Tuesday 18 July 1995]The S6 respirator which preceded the current S10, was brought into service about 30 years ago. Remaining records relating to this period are held in archives and to establish whether they contain information concerning user trials and acceptance would incur disproportionate costs. It is known that a study conducted in 1957 by the Army operational research group of the Department of the Scientific Adviser to the Army Council recommended the acceptance of the S6 concept.