Ahh. I was confused because I'm on the left, non-dieseling, side of the Atlantic. 
You should be able to run biodiesel in there with no problems whatsoever. There is no conversion necessary, and if you have any problems, you can always switch back with no issues. One of the beauties of biodiesel is that you don't need to commit to the fuel... if you're running low and there isn't a station that sells bio nearby, just fill up with regular diesel.
The only possible issue is if you have a ton of miles on the car already, in which case the biodiesel may clean out your fuel system and leave you with clogged fuel filter. This is a good thing! It's ridding your system of the accumulated junk of running petroleum diesel all this time.
Good luck! Tell us how it goes.