A ferry and 2 sensible days driving will have you down on the Costa brava or similar with decent daylight and fresh air even this time of year. We did just this in October and had a wonderful 2 weeks in and around the Pyrenees, perfect weather.
Or if you didn't want to do that much driving to/from the destination, you can get a ferry from either Portsmouth or Plymouth right to Santander (That is what Steve Coogan and Rob Brydon did in the 3rd series of The Trip).
Though worth bearing in mind that the Bay of Biscay can be pretty rough in winter :-(
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