This is an excellent route across the top of the North Devon coast, if you've never ridden it, you should definitely try it. Really nice bends, good scenary and some interesting gradients. The only downside is that it can be a bit busy at times.
This road is better riding from South Molton to Taunton as the corners gradually open up.
Not very long but nice combined with routes via salisbury and from Stockbridge on to Winchester