It's stated on the FAQ on the dutch Mitsubishi Website:
http://www.mitsubishi-motors.nl/veelgestelde-vragen/#!moet-ik-mijn-koplampen-afplakken-wanneer-ik-naar-de-groot-brittannië-afreis-
That's where i got my information when travelling to the UK. But I still got flashed a lot, anybody else...
Just came across this picture from Mitsubishi where you can see clearly the illumination of the window switches in the door panel. Maybe it's an option? 8-) Strange.....