Thank you for your quick reply. I'm ok with providing my ID and details about my bank, like telephone number and bank statements. But having to hand in this letter is really very strange thing to ask for.  So you demand from all your customers that they call up their bank and pay a fee for getting such a letter? I'm not going to do that. Sorry.

I also like to find out about the trading volume. Indeed a Very "organic" :-) question from C. Bergmann!