I live in Luton and the way I ALWAYS go is; A6 to just south of Bedford then turn west onto the A421 for one junction, then turn onto the A428 all the way to Turvey. In Turvey, turn right onto the road for Carlton. at the crossroad in Carlton, turn left and that will eventually bring you past Hinwick and then Airfield Road on the right.
Much of the route is minor roads but it has the advantage of avoiding the motorway and going through Bedford.
Anything Nostalgia Related.