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.

Is it? I've never heard of this before... and yet have had to comply with a range of other laws on the web.

Do you have any links about this? I don't like to think we have clients unintentionally breaking the law.

I know it's an obvious comment but that's only if you sell online :)