As we are often willing to take mid week bookings - and be flexible with dates - this may enable you to obtain a good ferry deal?

From UK the drive from Calais/Boulogne to Cap de la Carrere is 10 hours on the road using the main/toll roads. Allow 11 with stops. Allow 11/12 hours on return and you should be OK with stops/Paris/check in times.

The drive from Santander if you take the Plymouth ferry from UK is 4 hours.
This page may be out of date as we tend to use the Chunnel and are not at all up to date with the latest ferry deals.