I didn't bother when i went to France last year? but have seen them fitted to the lense cover on some Tivs, think it's a case of trial and error infront of teh garage door.
Yeah what they said. I tried dabbling with some tape on the headlight cover, in front of the garage door, but only to work out roughly where to put it. Reality was I didnt hardly drive in the dark while I was over in France, but was planning to show willing, with a bit of tape.
les flicks didn't mention the lack of light defectors when they pulled me last yr, so wouldn't worry unless your doing alot of a road driving in the dark
i go over to belgium a lot on business, so i'll probably just chance it and try the gallic shrug if i get pulled over in france. not sure what the equivalent is to the flemish though!