Informal Challenge Form Enter your notice details You will need the following information to complete the process: the notice number that was issued the vehicle registration number that was issued the notice your contact details a statement of reasons as to why you are challenging The notice number and vehicle registration number can be found on the front of the charge notice or correspondence you have received.All fields are required unless labelled as optional. Notice number Example: XX30020006 Enter the notice number as shown on the documents you have received. Vehicle registration Example: T123EST Continue Cancel