I have ridden most of these roads alebit not as one route (I live local but never have much time). As a whole route it should be great especially if you want a decent lunch/tea stop. With this route there a re a few sections that are bnot as well signed as they could be such as around Whempstead which is in the south east of the route. if you don't know the area you may take a few wrong turns due to poor road nam signs etc but this isn't a problem as the roads are all very nice around there.
A mix of two nice routes that others have posted, taking in a stop at Jack's Hill cafe for lunch. It's just how the run turned out on the day and was very enjoyable. Lots of nice scenery, loads of country pubs to discover and some good roads even out in the sticks. Hope you like it.