I put some info about this in the "No DPF Faults" thread earlier today. I copied the new rules from the government guidance on this subject.
The full guidance notes are here.
https://www.gov.uk/government/publications/diesel-particulate-filters-guidance-note<?: prefix = o ns = "urn:schemas-microsoft-com
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The full guidance notes are here.
https://www.gov.uk/government/publications/diesel-particulate-filters-guidance-note<?: prefix = o ns = "urn:schemas-microsoft-com