I am trying to apply for BC and I have slight issue with my WRS. I just have been to Nationality Checking Service where I have presented all necessary documents, including WRS card with my photo and name, dated on 19/07/2006, which looks like this:

I have been told that there is another type of WRS card that include name of the employer and that I need to provide it. My problem is that I have never seen such a document.
To support my application I had with me:
- a letter from my employer (written on 3/07/2006) stating that I started work there on 15/06/2006,
- contract, signed on 16/06/2006
- p60 for 2006-2007
- a employment termination notice letter from a 22/10/2007
- p45 when I was leaving this company (from 31/10/2007)
- all payslips from June 2006
- a blue 'UK residence documentation for a national of an EEA state" book, type: "registration certificate" issued on 17/08/2007
All of this is apparently not enough and I need to provide mentioned WRS certificate with employer details. I have been given phone number to Home Office in Sheffield (03001234699) where supposedly I could obtain a copy from, but two people that I spoke to said that they don't know how to help me and that I should call Immigrations (at 08706067768). I called there and I have been told that I can only send an email at barcenquires@ukba.gs1.gov.uk. I have googled this email address and it seems like the email to section of Home Office that deals with work permits for Romanians and Bulgarians.
I was wondering if any of you had any experience with similar issue? Is there actually another WRS card? How I can get it? Why my WRS card with all proofs of uninterrupted employment is not enough?
I will be grateful for any help or suggestions
Tom