Does the tertiary highway classification correspond to 'C' roads in the UK?

I recently found some inconsistency in the usage of tertiary highways and attempted to fix them based on local authority classification. However, I’m not sure if this is the correct approach since I’ve noticed other highways have been downgraded on the basis that they were ‘incorrectly’ mapped. It’s not clear what the correct approach is. I would tend towards using the classification and ensuring that the lane count is correct but I’d like to hear counter arguments before applying this any further.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/does-the-tertiary-highway-classification-correspond-to-c-roads-in-the-uk/4266