Nicely detailed instructions made the car park easy to find. However, when I tried to prepone my arrival time, the app took forever to do so and was unable to send the new code for entry in time. And the more frustrating part was that you are made to speak to robot not a real person when you phone justpark. And unsurprisingly not only is that really time-consuming (as you have to go through all the instructions from scratch each time) but also the machine is unable to help. They absolutely need to change this and have an actual person to help on the phone, as often our queries are short and urgent.