You will need to buy a headlight beam adaptor kit from a car accessory shop. You stick the adaptors over part of the headlights which prevents your beam from dazzling other drivers when you drive on the right. These are compulsory in France, Italy, Croatia, Spain, Germany, Switzerland, Belgium and the Netherlands.
Remember to only attach these once you are on the continent if part of your journey is overnight in the UK!
Dipped headlights must be used all day in Switzerland. In Italy, dipped headlights must be used when driving on motorways or dual carriageways