Apparently not, according to TfL. The new T (toxicity) charge in London comes into force on 23 Oct and will be applied to all non-compliant vehicles entering the central zone. When checking my registration on the TfL website, I was informed that my car did not meet Euro 4 emissions. My V5C document makes no mention of Euro 4, although it does provide the actual emissions data which is well within Euro 4 (and for that matter Euro 5 also). I suggest that if anyone is contemplating driving into central London on, or after 23 Oct that they check the TfL website before a penalty notice arrives on their doormat.