Hi there to everyone. Thanks for the replies so far.
sorry i took so long to reply , an illness, and some personal stuff has held me back
I looked at route generator, it didn’t quite appear that this met my needs due to it being photographs and having to expand large areas in photographs.
At the moment I am investigating OSMand have posted in the community there a refinement of my question. You could think of this by say taking a Greek area and creating a GPX file with a route, but then adding new waypoints to that route LATER WITHOUT forcing the route planner to go back over roads, that are already marked on the previous stages .
This will give the route a much cleaner and tidy appearance. It will gradually fill up the areas I have passed with blue (or whatever colour) lines.
I wonder if there is a limit to the size of the route I could create.