My husband phoned the job center here in our area- then they booked me for an appointment, that was July 2012 and so I went there and had some interview, I had with me all the documents needed, e.i passport, FLR (visa), Marriage cert., and my husband's NI number.
Then I asked them If it's possible to use the last name of my husband though in my passport and in my FLR(visa) it's still my maiden name, and they said YES. After 2 weeks I got a letter from them with my NI number..
Wish you'll sort your's also.
cheers..