Thank you for your comments and support !!
Co-driver/travelling mechanic will be Juliet. Not sure how much driving she will do, but since we haven't decided on a route, or stops, yet she will be doing the planning on the hoof. I even bought a good old-fashioned Michelin road map so we can search out those lovely "green-lined" French roads
As an alternative to the above paper system, a friend did a Chat-GBT "plan a route for an old car between X & Y, max speed 50mph, avoiding motorways etc " - interesting results
Need to be back by Thursday lunchtime, if possible