The Dunlop Maps
32 map cards contained in a case with clear front and back panels.
26 cards cover all of the British Isles (at 12 miles to the inch), plus larger scale plans of London, Glasgow, Snowdonia and the Lake District (plus two index sheets).
More details on Motoring maps are on the Publisher's page.
Scale correct at 20 miles = 42.5mm, or 11.9 miles/inch, ie 1:750,000.
No railways; no airports. Stanford-le-Hope is by-passed (opened by 1935). Has print code "348" - meaning March 1948 perhaps?