Dover to Calais https://www.dfds.com/en
Once on the road you may prefer to choose a scenic route, but motorways will get you here the quickest.
From Calais you might go via Paris, Orléans and Tours to Bordeaux, then south on the A62 to Aiguillon. Coordinates for Burthes, Aiguillon,
N 44.32677 E0.38358