The age is irrelevant - the ULEZ is charged based on the declared Nitrous Oxide emissions from the car. However it's been illegal to sell new cars in the UK that don't comply since about 2005, which is why you often hear the age of the car being brought up - but the age itself isn't actually relevant.

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>Nitrous Oxide - we don't want Sadiq Khan laughing do we ?

Just fitting a cat doesn't bring the emissions into that range for the ULEZ.

And the range for MOT and ULEZ are different, otherwise every car on the road would be able to pass through the ULEZ, wouldn't they?

The ULEZ is a stricter set of measures for the given area, and that means that some older cars - even those with cats - won't be able to pass under that bar.

Same way that for years diesels would have passed, but since we realised what their ACTUAL emissions are, they don't qualify.

It's to do with actual recorded emissions, not age or technologies involved.

Haha! Woops - nitrogen oxide!

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