Well, second leg completed...
600 km. Could be done by the car with one charging stop, but the humans and the dog needed two stops... I therefore charged twice along the route, first in France and then in Switzerland. Each time I arrived with over 50% of charge, so a very comfortable journey as far as charging goes.
Again, I can't believe how backwards is our motorway charging infrastructure in the UK (based on posts here and elsewhere) compared to France and Switzerland. There are ultrafast chargers everywhere, and very cheap electricity. The charging stations are clean and comfortable, with dog exercise areas, no faulty charges and no queues (very vary few other cars charging....).