'The 1920s and 30s saw the rise of the British tourist industry when, for the first time, ordinary working-class people had enough weekend leisure time to leave their smoky factory towns for a couple of days, and take to the country with its fresh, invigorating air.
It was the beginning of the cycling crazes and the hiking boom, and railway excursions, and - for those who could afford it - days out in the car.
All over the country, map-makers were producing maps of the most attractive areas, and walkers, cyclists and motorists were buying them in their millions. Fierce competition raged between these map-makers until the Ordnance Survey engaged an artist called ELLIS MARTIN to design eye-catching covers for its maps. From then on, the Ordnance Survey led the maket and Martin's superb period designs for OS map covers are now collectors' pieces.' J P Browne Map Cover Art
For other examples of finely drawn commercial art this links to a post I did on cigarette cards.