Can I suggest the following in South Wales - The Rhigos Road - the A4061 from Treherbert to Glynneath (taking the old Rhigos Road up from Glynneath, rather than the A465).I got lucky in August and the section at Treherbert was closed, so I had the first half of the road from Hirwaun Industrial estate to myself:) It can be coupled with The A4107 from Port Talbot through Cymmer to Treorchy. If you're doing the A4069 from Llangadog to Brynamman (I agree with the recommendation for this route, though the 40mph limit is a shame) and need to head N from Llangadog, then the A4069 from Llangadog to Llandovery is more interesting than the A40 option. The A481 from Builth Wells to Llanfihangel-nant-Melan (especially the Northern section after Hundred House). Not exactly ideal for a 7, but if you're near Beulah, Abergwesyn Common and the Devil's Staircase are great views (though the forest thereafter from the start of LLynb Brianne towards the dam wall has been cut, so it's a lot less scenic.The section from LLyn Brianne down through Rhandirmwyn to Llandovery is still scenic and is more 7 friendly as the road is wider as it was used for the dam's construction traffic.