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I've never done the F2A/25 course, but I've done the F2A/10 and the F2D/10 courses which run over the same bits of road. It's pretty exposed, particularly west of Cambourne and around Bourne airfield. The vegetation on the north side of the road should provide some cover on the way back, but you'll definitely notice the wind when you go past the airfied and on the run up to Caxton Gibbet RAB. Most of the course definitely isn't in a cutting.
I'll be at the Cambridge CC 25. Look out for someone in a battered old green Mini.
How will the forecasted 10mph NNW wind affect the course? From Streetview it looks like it's set in a cutting.