> "option" for a maximum ten years before it's considered part of the basic accoutrements in a modern car Just isn't really practical. Satnavs have been option

> "option" for a maximum ten years before it's considered part of the basic accoutrements in a modern car Just isn't really practical. Satnavs have been optional for that long, yet my mum doesn't want one, why should she now be forced to cover the cost of it because it's included in the base price? Etc.