I can't find a historical justification for the path we are discussing to have a PROW tag but it certainly doesn't conform to the current description for FP 11 at https://www.hertfordshire.gov.uk/media-library/documents/environment-and-planning/countryside-access-and-management/rights-of-way/definitive-statements/north-mymms-2015.pdf or the definitive map at https://webmaps.hertfordshire.gov.uk/row/row.htm so I've deleted it.