The switch from MPH to KPH has to be done manually when are reach another country by going to Settings -> Regional &Voices-> Units.
I have no idea how I didn't see that option in settings. Blindingly obvious now ;-)
I have searched and am guessing (though it doesn't appear to be explicitly said anywhere) that my Speed display will switch automatically from MPH to KPH as I ride off the ferry into France. However, I wanted to be sure as there doesn't seem to be a switch within the App (iOS) to select it.
I wanted to be sure before we head off on a journey and I'm fumbling about trying to set it if it doesn't do it automatically.
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