The firm of W. & A. K. Johnston was based in Edinburgh and established in 1826. In addition to producing their own maps they made maps for a number of other publishers. Much of their output consists of repurposed pre-war mapping.
W & A K Johnston maps
MAP 4804: "Daily Sketch" war map - 1914
Aa 1078: War map of the Western Front
Ab 1488: War Map of Europe
Ab 1489: War map