Where can I find the asset / serial number for a Charge post that I want to report as faulty?

There are different types of Charge posts in operation; all should have an easily found sticker with our phone number (0203 056 8989) and an ID number (what we call the serial number) on them. The ID number has 3 digits then an underscore then 5 digits. i.e. 100_12345

Park & Charge
asset serial number charge post fault digits