There is indeed a French National standard for 75 ohm E1. (Unfortunately I can't locate the number. I will check and get back to you by e-mail and I'll post it here for everyone).
Be aware that CTR 4, the pan-European harmonized standard for E1, is for 120 ohm Primary Rate ISDN. This is the direction that digital interfaces are going now. There has not been any publication, I don't even think that it is being discussed, of a CTR for 75 ohm. Each EU country has their own standards for 75ohm. As far as differences between the UK and the French, I believe there are some minor differences. You need to get a hold of the French national standard (The French DO NOT publish in English. You should look for someone who sells standards). John A. Juhasz Product Qulaification & Compliance Engr. Fiber Options, Inc. RCIC - http://www.rcic.com Regulatory Compliance Information Center
