Motorhome storage Spain

Hi all, I’ve took the plunge and bought my first motorhome, my intention is to tour the U.K. in spring and summer then head to Spain/Europe for the winter months. Was thinking of travelling down through France to Spain mid November but flying back for Christmas/New year then returning in January, does anyone know where I can find good storage facilities where I can leave my van safely. I am not yet sure what airport I will return from so would appreciate advice from different regions. Thanks in advance, John.