If you area using OS Explorer Sheet 149 as a source, this is subjrect to Ordnance Survey's copyright and MUST NOT be used as a source for OpenStreetMap.

There is OSM-compatible open data available for Public Rights of Way (PRoWs) in you area, available from
https://osm.mathmos.net/prow/progress/kent/swale/swale-rural/

There's a more information on copyright and OSM at the links below.

https://wiki.openstreetmap.org/wiki/Copyright
https://wiki.openstreetmap.org/wiki/Ordnance_Survey
