Dugdale's Curiosities of Great Britain, England and Wales Delineated
Still using the Cole & Roper map, with projected railways into Cambridgeshire and Suffolk (opened 1845 and 1846 respectively); the railways are not described as "projected" or similar, but their very schematic lines indicate that that is what they are. This is the same map as in the original 1835, but the addition of the railways shows that this one is probably from the 1838 edition.
Later editions use Archer maps.
Scale correct at 1+10 miles = 37mm, or 7.6 miles/inch, ie 1:485,000.