You haven't said what other sites you're using but I would lean towards believing the TfL site is the most accurate. That said, I actually think your model is a Euro4 so I'd get in touch with TfL. I used the reg of another vehicle that's the same model as yours from 2007 and the ULEZ checker said it was exempt, you just have to pay the congestion charge. I'm not sure if TfL is incorrect (because you haven't given me your reg to check), or whether you've seen you still have to pay the Congestion Charge and might be confusing that with the ULEZ. If the latter is the case, there are only a few exceptions to paying the CC. People living within the congestion zone receive a 90% on the charge, although you must be a registered resident to qualify. Blue Badge holders qualify for a 100% exemption from the Congestion Charge but you must register with Transport for London and pay £10 before travelling. Disabled drivers that are exempt from road tax are exempt from the Congestion Charge and do not have to register. Motorbikes, mopeds and bicycles are exempt, there's also a Cleaner Vehicle Discount for some electric and plug-in hybrid cars and vehicles with nine or more seats. Basically, everyone else has to pay it.