What Percy Addison did before his wartime recall

What did Percy Addison do between retiring from the Royal Navy and being recalled in 1939?

He remained Director of Dockyards until 1937 and then worked as a consultant to shipyards before his wartime recall.

Although technically retired in 1929, Percy Addison remained Director of Dockyards until 1937. During the shorter interval from 1937 to 1939, he worked as a consultant to shipyards. His dockyard and industrial knowledge therefore remained in use throughout most of the period before his formal recall. The answer resolves the apparent ten-year gap in his service record.