Tax Exemption form from Germany

[crispy]

Hi,

I've been sent a tax exemption form by a German organisation (a publishing house) so that I don't have to pay 15% tax in Germany on a pending book advance and any future royalties.

It apparently has to be signed by HMRC but I have no idea how to do this.

I called the HMRC helpline today and a telephone agent explained that HMRC don't have local offices any more and that I should send it by post to "PAYE, HMRC, BX9 1AS" but that can't be right can it? Even she seemed not to trust this system and advised that I take a copy before sending it, "just in case".

Does anyone know what I'm supposed to do?

I'm a first-time poster here. Thank you so much for any guidance.

[crispy]

Okay, never mind. I have sent it to the address provided.