• Old motorcycles have a curious ULEZ advantage. You're not constrained by official emissions figures or paperwork, you just go for an emissions test. The people at the testing station pride themselves on getting a pass for all kinds of ancient things, including 2 strokes from the '70s and '80s. And you can help the bike with a dose of petrol additive.

  • Older bikes and cars don't have Nox emissions figures as they were never tested for Nox.

    Running the engine rich, reduces Nox by reducing charge temperature. Speak to the guys and they will tell you how the bike will pass.

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