London Congestion Zone Checker

This app checks how far you are from the London Congestion Zone and notifies you if you enter the zone at a chargeable time.
It also gives you options to conveniently pay the charge to TFL (Transport for London) at the click of a button by phone, text message or online.
The trial version allows you to make 5 entries into the zone before you need to make a very modest one off purchase of £1.50 to continue to use it.
Please note this app is not provided by TFL but is designed to make sure that you do not forget to pay the charge and hence receive a very expensive penalty charge notice through the post. The London Congestion Charge purchases you make via the app are made direct to TFL and the app does not charge extra or make any commission on them.