Makosa said
There had been an experiment carried out in CDG in 2000 (or 2001?): everybody had to speak english on the radio, it turned out to be a big mess (some AFR pilots have a terrible level of english) and nobody was properly prepared actually..
Interestingly JAR Ops 1 Subpart P 1.040 presribes the use of English in Ops Manuals
unless national law states otherwise.