Until it is a European law they can't force foreigners to adhere to their rule when it comes to clothing.
In France helmets also need to have x surface of reflective material. People from other EU countries don't need to have that on their helmet last time i checked (year ago).
http://wiki.answers.com/Q/Does_150_cm2_ ... _cm_thanks
Apparently most clothing with built in reflective pieces would have been sufficient anyway.
They were not talking about compulsory hi-viz jackets.
Still it was a silly proposal for the reasons mentioned and was scrapped.