His brief Wikipedia entry is here. A more extensive treatment can be found in his obituary in the Independent. I wrote about his poster art here.
In October I visited the Royal Air Force Museum London located at the former Hendon aerodrome north of town. Besides aircraft and support vehicles there was a small gallery of aviation paintings, several by Wootton. The one I focus on in this post is titled "Harts Over the Himalayas" (c. 1967) that shows three Hawker Hart biplane bombers in the north of India during the 1930s. Closely related to the Hart was the Hawker Fury fighter that in turn was an ancestor of the famous Hawker Hurricane fighter that comprised the bulk of Britain's interceptors during the 1940 Battle of Britain.
Below are images of Wootton's Hart painting.