https://www.gov.uk/general-rules-all-drivers-riders-103-to-158/general-advice-144-to-158 possibly posted already but this states ( 151 ) that drivers should be aware of cyclists filtering, aka ' undertaking' on the left...therefore 'undertaking' in slow moving traffic is not illegal ...just do it sensibly!
@petertreglown started
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https://www.gov.uk/general-rules-all-drivers-riders-103-to-158/general-advice-144-to-158
possibly posted already but this states ( 151 ) that drivers should be aware of cyclists filtering, aka ' undertaking' on the left...therefore 'undertaking' in slow moving traffic is not illegal ...just do it sensibly!