Bullock mentions joining the Territorial Army at the outbreak of World War One.
His Glasgow map design, undoubtedly more restrained than his later maps, nonetheless provided a template that Bullock would replicate repeatedly in subsequent cartographic productions: a finely designed central map, annotated with informative details & references, accompanied by a surrounding decorative border of colourful coats of arms and heraldic devices.
These would become his personal hallmark as a cartographer and undoubtedly accounted for the enduring popularity and longevity of his maps.
The England & Wales map was subsequently substantially revised and updated in the 1950s and 1960s and went through numerous editions.
One of the last was one offered free with purchases of petrol at Shell service stations in 1971.
His presence is reported in the national & regional Press during the late 1940s and early 1950s at official Conferences & meetings and regular Civil Defence exercises.