I drive to Gibraltar usually once per year and always fit the headlamp adaptors to my car.
On returning last time whilst on the Channel Tunnel train the guy next to me was from Holland and noticed me taking off my headlamp adaptors. "what
are those for" he said, I have to put them on when driving in Europe so I don't blind oncoming drivers. "we
don't do that when coming to the UK he said!!
One rule for them one rule for us