I won't be sure which bike I'll be using for this one until I see the weather forecast a few days before. Certainly won't be riding fixed though.
If the weather looks OK, I'll travel light and ride my Roubaix with a 50/34 compact and an 11-28 cassette. I have a spare rear derailleur that can take a 32 sprocket, so might invest in an 11-32 cassette if I bottle it. Depends how the BCM and K&SW go.
If it's bad weather and I need to carry more stuff I'll ride my Dawes Audax, also with a 50/34 compact and an 11-32 cassette.
Both bikes have the same lighting system with Shimano DH-3N80 hub dynamo, B&M Luxos front light and B&M Seculite rear light plus LED battery back ups.
I have ridden many of the roads before so appreciate the enormous extent of the challenge to ride them all in one weekend. Should be fun!