Even though this is my first Caterham it is far from my first convertible. I always degrease the factory grease from the rails and other moving bits then use a dry lube, use to use a Finish-line mountain bike dry chain lube, I switched to DuPont Non-Stick Dry-Film Lubricant Aerosol first car I tried this on was my '18 AMG GT C Roadster and it has ingress & exit seat movement so it gets movement every time it's driven. On my Caterham the one rail (the floater) will slide with gravity, easy as a hot-wheel car on a hot-wheel track when the seat is removed you have to be carful as the rail is kind of sharp and could scratch something -I use a rubber band.
If you find you want to move forward more even after pedal adjustments (mine doesn't allow this) you can flip the rails. Note: as you move more forward your belts may become out of proper alignment to your body so their anchor point needs moving. There is seat belt hardware for doing this.
In the picture you can see written on the floor in pencil "OE and Flipped +1"", the rails will actually hit the frame, you can see the locking rail is at the most forward lock position before it hits the frame -it could go farther if the rails where spaced higher to clear the frame. The whitish haze stuff on the rails is the dry lube.