I've got a Michelin atlas of the UK and Ireland, dating from the early to mid-90s, that does the same thing. It also distinguishes between high-quality and lower-quality dual carriageways. Seeing the UK mapped in "Continental" style gives a different perspective.
A quick web search suggests it's no longer produced - I've certainly not seen one recently.
I think I got it as a free gift for taking out a year's subscription to Top Gear magazine.
I just dug this out - dated 1994. A nice atlas, 1:300 000, scale, covering the whole of Ireland as well, and including a lot of detailed town plans and enlargements of urban areas.
There's a bit of scenic route marked on the M74 near Crawford, but nothing on the M6 through Lunesdale and over Shap which arguably is considerably more scenic. The A74 (as was) is shown as scenic pretty much all the way down to Lockerbie.
Most of the well-known roads in the Peak District are marked as well, including the A626 between Marple and Dinting, a fair bit of which is actually built up. I suppose it's inevitable the selection of scenic roads will seem a little arbitrary. I find it surprising, for example, that none of the B-roads radiating south and west from Bridgnorth and Much Wenlock through the Shropshire Hills are marked in green.