A4212 Bala to Trawsfynydd (drove it for the first time last week, sadly in the Z3 not the Mog). Don't know about hostelries, didn't stop!
An unclassified road that runs from Abergwesyn (north of Llanwrtyd Wells) to Tregaron - last driven in the early 80s, hope it's still as good.
Gerwyn (GLLHG) knows lots more - I haven't brought the road map in today...
Broadway, south on B4632 to the village of Toddington, turn left at roundabout onto B4077 for Stow on the Wold. The twisty climb up the side of the Cotswold escarpment is great - just beware it can attract slow moving traffic. Hostelry - the Plough at Ford, or turn right before Ford and head to the Half Way House in the village of Kineton.
Cheers,
