These are known as landranger maps. Again many areas can be bought laminated (active maps). They don't have anything like the detail of the 1:25000, they don't show field boundaries for example. However, this means they have a much less 'cluttered' feel. They are a popular map for navigating in Scotland in winter, this is because there is so little clutter that the contour lines really show through giving a great feel for the shape of the land.

You can buy OS maps from here.