If you're a Londoner who thinks your bike will pass a NOx test
From
https://tfl.gov.uk/modes/driving/ult...opeds-and-more
Motorbike emissions testing
We will also accept evidence from test facilities approved by us for measuring NOx emissions. If successful, the test facility will contact us with the results.
Test centres that believe they can offer motorcycle emissions testing to the required standards should email their contact details to ruculezenquiries@tfl.gov.uk.
Approved centres for motorcycle emissions testing
Riverbank Motorcycles Ltd
Unit 12, Riverbank Business Park
Dye House Lane, Bow
London E3 2TB
they're on 020 8983 4896
I haven't talked to them yet but have been told they charge £175 and are linked directly to the MOT system so a pass will immediately exempt your bike from ULEZ