F11/10 has a gift hill half way through. And I think the F2D/10 could be pretty fast - very flat and good road, but prob lacking traffic. https://www.cyclingtimetrials.org.uk/race-details/11425
F2D/10 is fast, and can have reasonable traffic levels if everyone in Cambourne is going shopping in Cambridge. My 10 mile PB is from the F2D/10, and that's after having riden the E2/10 twice.
@Brommers started
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F11/10 has a gift hill half way through. And I think the F2D/10 could be pretty fast - very flat and good road, but prob lacking traffic. https://www.cyclingtimetrials.org.uk/race-details/11425