He was promoted to flight lieutenant on 1 January 1944 .
During World War II Clayson returned to active service in the Royal Air Force Volunteer Reserve being appointed a flying officer in the Administrative and Special Duties Branch on 20 December 1941 .
Clayson was promoted to flight lieutenant on 1 January 1944 .
During World War II Clayson returned to active service in the Royal Air Force Volunteer Reserve being appointed a flying officer in the Administrative and Special Duties Branch on 20 December 1941 .