Are you asking if you can pre book parking in Southampton, if so yes you can. Contact your travel agent & they will get you a number to call to book. I would recommend it, just saves the hassle when you get there.
Candps.co.uk stands for cruise and passenger services linked to p o provides secure valet parking at dockside terminal excellent service superb ship been twice due again you will have a fantastic holiday any more help needed.
I used cruise and passenger services when I cruised on Oceana last year. Very efficient buy whatever you do make sure you keep the paperwork they give you to hand (mine was accidentally packed in a case) as there will be a hell of a pallaver getting your car back without it.
Depending on how many of you are travelling there is also a good alternative. If you book a room for the night prior to sailing in either of a couple of the good hotels near the terminal then they will include parking for the two weeks in the cost of the room. So if you are a couple it works out at about the same price but you've had a refreshing stay overnight and you can get a taxi right to the departure lounge and back to your car without having to queue to deposit and collect your car.Regards,
P.S.If you want to know the hotel details then I will post them online for you on request.