This bit of road is ok but very short. I have put on a route that starts at Leighton Buzzard on this road and goes to Ampthill. This encorporates some pleasant roads and makes the route longer.
Mostly double white lined so best caught when traffic is light (I rode it at around 10am on a Sunday morning) It is possible to overtake but watch you don't get into trouble doing it. There are some nice open bends with some good surface and a couple of nice (if a bit blind) 90 degree ones.