I did find out that it was because the main speedo doesn’t have KMH on it so had to display speed in KMH on digital readout just in case you went abroard, the massive hole in this argument is if you do go somewhere it is needed it takes 2 seconds to untick it on the MFD so just a load of crap from VAG yet again. In my old Citroen it had a dedicated button on the dash to swap as it only has one digital speed readout and no dial.