Here in Huddersfield you can't get an appointment with the people at the Job Centre (the interview people) unless you have a month's worth of pay slips. I had only done 4 days of temping work (thankfully, one day a week, so at least I had a month of slips
) and yet they STILL questioned me. I was getting pretty wound up there, cause as people have said, you don't NEED to actually be working, just looking. And here I was working, and had the documentation to show for it, and I was asked if I was still working, and 'So I could call up right now, and they would say that you are on their books...?' Grrr!!
Then when I asked the guy some questions, questions that I thought were my right to know (uh, being this is MY LIFE that's under the microscope) he told me that 'if you ask your bank that be ready for them to close your account without any warning' and 'I'm not hired and it's not my job to answer your questions'
All I wanted to know was that if the bank had no LEGAL reason to request my NIN number (we kept getting letters from the bank saying please give them my NIN number, which I didn't have yet, but yet we kept getting letters), then could I please tell them that they had no right to my NIN number and could I ask them to stop sending me letters. That was the response that I got.
I just kept smiling and bit my tongue until I got out of there (then I went on a rant)
Good luck, it's frustrating, but you will get there in the end. Like Ashley said, the agency that I went through to get my whole 4 days of work didn't bat an eye when I said that I didn't have a NIN yet. They just used a temporary one.