@Rob-Verhoeff Actually Rob, I created the route using the HERE map, and then once complete, compared it against the TomTom map (as I find that that can iron out some "route changes" between the 2 Sat Navs.
This all used to work ok, its just over the last couple of months that I'm finding discrepancies between the app and the PC version of MyRouteApp so much so, that I'm now at the stage of having to double check that the route loaded to my Sat Nav directly from MyRouteApp actually does reflect the route I've planned.