Why can't I change my booking?
It's not uncommon for certain bookings to have restrictions on changes, especially if the booking has already started or is set to start on the same day.
On or after the day your booking is due to start it can't be extended. Your car will still be parked for as long as you need, but you'll be charged for the extra time.
If you've booked a car park where someone parks for you (e.g. Meet & Greet), give them a ring so they know when to expect you – their contact details will be on your booking confirmation.
Otherwise, collect your car as normal and pay for any extra time when you leave the car park. They usually charge their standard rate – there's more information about rates on your booking confirmation.
Keep your overstay charge receipts if any additional parking time is caused by a flight delay to claim back on your travel insurance.