That is very useful - thank you.
Tracing the route from the pdfs is,as you say, difficult, but I have done it in detail for our area.
Would you be willing to make amendments if we were to suggest them?

I have added you as an editor for the map so you can go in a tweek it yourself. Do take care to not change the map base away from OpenStreetMap and do leave the view being an overview of the whole route before saving. Possibly you could leave a message here when you are done. I can't see how to send you a private message - is that possible?

I don't see your thin green lines. Could I ask you to nudge the line itself rather than adding additional lines. The KML export will then be the actual route. Re trusting, for sure and I would make it an open wiki map if there was a good tracking and roll-back system. It was an open wiki map for the first few weeks and I then closed that option down when it was pretty accurate. thanks for the email address

I have moved the route - also added a marker for a tunnel (sorry if this is the wrong thing to do).
I've deleted the comment containing my email address - will provide it again if you wish.