Transfer service is dependent on each individual car park via the following options:
Shuttle service You should go straight to the car park, park your car, and then the shuttle bus will take you to the airport/port. Please check if there is a timetable or if the shuttle bus operates 'on demand', in which case you will just need to provide your estimated arrival time at the car park and keep the operator informed of any changes. You should keep your booking voucher with you for the return so that you have the shuttle bus timetable (if applicable). However, many car parks require you to just call them once you have collected your luggage in order to send the shuttle bus to pick you up.
Meet Greet Service Meet Greet Service is becoming more and more popular as a way of getting to the airport/port and some car parks actually operate this transfer service exclusively. You will need to provide times for the driver to meet you at the airport/port and you will be sent the phone number for the driver with your booking confirmation via email and sms text message. You will normally need to call 15-20 minutes before you get to the meeting point to confirm your vehicle drop-off, and then again once you have picked up your luggage to have your vehicle brought back to you.
With regards to the transfer, you should always check your email booking confirmation as this will always contain up-to-date instructions relevant to the car park you have booked.