Not sure if anyone else is having a similar problem, but I can't seem to book my parking space due to a discrepancy between P&O and cruiseparking.co.uk.
On my P&O booking reference, it says parking must be booked a minimum of 10 days before your departure date, whereas on the cruiseparking.co.uk website, it says this must be done 35 days prior to sailing.
I booked my cruise fairly close to departure (with less than 35 days to go) so surely they wouldn't be offering this benefit if it couldn't be used?