Hi Dave - we don't have any way of updating the maps ourselves, but you can contribute to the open source maps that we use for our Paths map. We have some advice on how to do this in the following post: Make Changes to the Paths Map
John
Enable import of GPX files plotted on OS 1:25,000 maps so as to obtain functionality of Plotaroute for areas where footpaths do not exist or for GPX trackbacks from GPS units