this route is a dream with not a speed camera in site. The b645 from kimbolton to higham was previously the a45 so is wide and smooth. One point to be aware of is just past hargrave going towards higham is a massive straight, the approach to which consists of two small humps, between the humps the road kinks left and your front end will go light. There are tree's on the outside and they always seem to have a bunch of flowers on them. Don't wind it on until your on the second hump, the ensuing straight is long enough to v-max.