I agree, I used the Newhaven / Dieppe, cheap as chips. I wouldn’t rush France to get to Spain either, the main draw to Spain and Portugal being the winter climate not the scenery or culture.Y
You can do Newhaven to Dieppe & beat the Santander ferry to Spain. It’s our chosen route. Although we now take it steady as we aren’t time constrained, we have a route from Dieppe to Bilbao that avoids French autoroutes (and costs) takes in some stunning French scenery, has cheaper fuel & food, and free aires. Takes us a day & a half from Dieppe to Spanish border.