Don't worry. It's quite an easy process. My husband {then fiancee} and I also were on an American Spousal Visa and changed our minds. We had our appointment at the NY Consulate for my British Spousal Visa ... the day we flew to London!!!
We also had a letter from my husbands parents stating that we were staying with them and they were supporting us {altho we did NOT stay in Cheltenham where they live, but moved automatically to London to stay with my husbands brother for 1 month before we found our flat & jobs.} Anyway, they also provided a mortgage statement and bank account info.
We bought our resumes, our bank statements {also savings, stocks, mutual, etc... anything proving we had lots saved!}, marriage certificate, passport, passport photos... Hmm! What else?! A print-out of our appointment confirmation... I remember we did bring some wedding photos & cards {we got married 5 days prior} but the case worker didn't need them & actually giggled when she saw them, "How sweet!"
I will point out that we were 1st online outside the consulate. Once it was time to be let inside, there was a small line behind us. They would not let my husband in even tho we were there for a spousal visa. I was first in line inside for my visa to be processed. The case worker asked where the letter of support was from my husband. I told her I didn't have one, he was waiting outside and the guards would not let him in! She wrote on a piece of scrap paper "Please let Andy XXX in." Are you kidding?! Is this what "security" is coming to? I could have written it myself. Anyway, I had to go outside, get him and then get back in the line- waiting another 30 minutes. But I still got my visa less then 2 hours later and the case worker was really friendly.
Don't worry! Just have your paperwork in line, your appointment set up and you'll be ready to go! Good luck!
