Educated at Bletchley Grammar.
In 1932, worked for Beacon Brushes Ltd, Bletchley; apparently, brush-making is Bletchley's oldest large-scale industry and Beacon Brushes was formed in 1926 by 'Jack Cook and his sons'. See http://www.discovermiltonkeynes.co.uk
Arthur's father was called Arthur John Dennis Cook, but anyway by 1943 our Arthur was 'Works Manager and Joint Managing Director' of the firm, based at Church Farm, Wavendon, Bucks. Which is near Bletchley (that's enough mentions of Bletchley).
Competed in the King's Cup in 1934 and 1935
Although he had over 400 hrs flying experience before WWII, presumably due to a long lay-off from flying he joined as a Pilot Cadet. However, he progressed well ["a quiet and hard-working pilot ... he has worked keenly and well and his discipline has been excellent]", and was appointed 3rd Officer in September 1943, then 2nd Officer in Jan 1944.
During his ATA career he flew 29 single- and twin-engine types.