Over on the Footpath Guardians closed discussion group (www.ramblers.org.uk) is a thread about county council online mapping and problem path reporting.
The Somerset CC system is slow (at least on my system) but footpaths are labelled and problems can be reported directly on the map. The name of the reporter is kept anonymous but dates of reporting and action are available.
The Somerset site is here:
There's also some good information about the Definitive Map on this site.