Bio Diesel for new Bravos

Fellow Bravo's

Whats everyone opinion on this, I hear alot of talk about this so called bio diesel but I don't see any filling stations that sell it.

Is it good for the car's engine and does your warranty become void if its used in your car???

By the way my new Bravo is Awesome though thinking of getting it mapped. Does anyone know in Ireland that can do this for the new model Bravo's

I looked at a Volvo bio fuel S40, but due to no savings on company car tax & I think only a few places that sell bio diesel,(London/East Anglia & Scotland)decided was a no-no....
Still the Bravo is still the best value car around(for tax/CO emissions etc)