This data is essential for your business if you want to automatically add the congestion price / ULEZ charges to your customers when they book onine. Your web-developer can use this together with the correct charging hours to correctly charge the customer when your vehicle needs to enter the zone to service them. At time of writing congestion charge (all combusion vehicles) applies 7am to 6pm all working weekdays, ULEZ expected to be 24hrs selected vehicles - see TFL for more details.