You could call and ask for what documentation they need. However, when I called to get info from them, (this was last summer) since I was also applying for DH and DD (EU nationals), they processed all of our applications over the phone. They said they couldn't do mine alone over the phone, but since my family members were EU nationals, they just listed DH as the main applicant or something to that effect. We got all the cards in about a week.