I have the stick on convertors in their original packet which I always keep in the car in case but I haven't had to fit them. Any night driving I do on dips as others have said.
I rarely see continental drivers in the UK who bother, I'm not even sure it occurs to most of them there might be a problem. On the way to the station at 6:00 this morning I encountered a car with foreign plates not even bothering to adhere to our side of the road let alone adjust their headlights!
~iw