PS, while this thread's got everyone's attention... :-)
We lived in the UK before (2008-2009), but I was there under a work permit (this was before I registered as a British citizen per my British mother). This is why I already have a National Insurance number.
However, for the purposes of settling in the UK (now that I'm a British citizen), I am assuming that the above is irrelevant...because it happened before I was a British citizen it has no bearing on what I'm now requesting.
But you know what they say about assuming...I can submit the paperwork for my work permit, or other pertinent details, if you think it might raise any red flags?
-Ben