I wouldn't take PRoW refs from any source unless I was completely confident that it's compatible with OSM's license. It sounds like your Chiltern Society map is an annotated OS map, therefore unsuitable.
Unfortunately I think it depends upon where you live as to how well the refs are put up on signs. In the last few years I've found that my area of Kent have done pretty well with getting refs displayed. From: [email protected] [mailto:[email protected]] On Behalf Of Bob Hawkins Sent: 17 March 2010 08:52 To: [email protected] Subject: [Talk-GB] Footpath numbering Footpaths and bridleways are numbered on definitive maps but rarely on signposts or waymarks. Often numbered on a parish or community basis (HA10, for example), their use appears to be for legal puposes mainly, rather than as an aid to navigation. Having said that, my local Chiltern Society footpath map is annotated with the definitve numbers. So, I wonder what OSM mappers in GB feel about adding the official numbers to such ways. I suspect copyright is an issue because the rights of way numbers will invariably be on maps based upon the Ordnance Survey, unless anyone knows that they are available from another source.
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