[Luc]

Maybe. I guess it's possible there's a EU guideline that has to be implemented by the member states, but hasn't been implemented yet e.g. for me in Belgium.

Here's the guidelines (in Dutch): http://www.vbo-feb.be/files/ondernemingsnummer.pdf

So the website needs to contain the company registration number, the way it's incorporated and a bunch of other stuff, but not the bank account number afaics. Though the bank account number does need to be displayed on invoices.