If you could double the budget to £849 pp I'd go on P & O Cruise Oceana 1st Sept 14 nights Southampton, England : Cartagena, Spain : Barcelona, Spain : St Raphael : Florence/Pisa (Livorno), Italy : Alghero, Italy : Gibraltar : La Coruna, Spain : Southampton, England

Or for 50% over budget £599pp November 11 nights Oceana
Southampton, England : At Sea : La Coruna, Spain : At Sea : Casablanca, Morocco : Seville (cadiz), Spain : Malaga : Gibraltar : Lisbon, Portugal : At Sea : Southampton, England

Enjoy some sundowners in the Crows Nest whilst Mrs chin wags with the crew