I’m on 70k with 2 months left, scenic won’t be ready in time and was advised that it isn’t pro rata, it essentially classes as extended lease, this ties in with last car that was over mileage.
Friends were over 60k and didn’t get charged and they handed over dead on 3 years, and our first car was returned early and pro rata would have meant we got charged.
in conclusion, I’ve decided it’s completely random and I’ll expect to be charged and hope I won’t 🙂