Thank you for your valid feedback. This particular discount offer, as stated on the email, was valid for parking purchases costing over £50 - this would be why the offer did not show up during your booking process. We apologise for any confusion caused. In terms of inputting details, we absolutely agree with your comments and are currently in the process of developing an account system, wherein all your details will be logged and ready for your next booking. Thank you for your repeat custom and watch this space!