grassi

The file goes to NVC for only a few days. This is the hand-off to the Dept of State. Gets a new case number LNDxxxxx and is sent to London. USC petitioner gets a letter from the NVC telling new case number and it's gone to London. You have to get to the NVC or your case won't get to London for the rest of the process. It sounds like it is still with your service center or NVC has misplaced it or put a typo for your case number in their records and can't find it on the computer. London takes a couple of weeks maybe, but eventually logs in your case and sends a paper letter to the UK person with instructions on how to apply for the visa.
For you London preparation start reading HERE http://www.visajourney.com/forums/topic/350185-london-2012-k1s-from-noa2-to-interview-thread/
Then post #6 down the page will tell you all about "packet 3".
Edit: Just saw you had some answers while I was posting. No, you do not schedule your own interview in London. No you don't get a packet. Follow my links for London's process.

There's been many similar threads started in the last week with the topic I got my NOA2--Now what?? If all the questions are in one thread, people may find the information they need more easily. I'll start off with some general information specific to London K1s.
Advance preparation for the London part of the K1 process
When your NOA2 is near, it’s a good time to start your preparation.
Petitioner:

Order your tax transcripts. Only the most recent tax return is required, but you can order three years at a time for free from the IRS. Tax transcripts are summaries of your whole tax return provided free by the IRS. They can't be faked because it's a copy/summary of your whole tax return picture, basically certified by the IRS because it's issued by them. That's why you don't have to include any 1040, Schedules, W2s or 1099s if you send a transcript. They are free from the IRS. Transcripts take the place of sending a complete tax return.
If you call 1-800-908-9946 (the transcript line) , there is an automated system for ordering transcripts. You'll have to enter your Social Security number and the numbers of your street address. It will generate an automated request to mail your transcripts. You can also order online on the IRS website http://www.irs.gov/individuals/article/0,,id=232168,00.html
Start filling out the I-134 Affidavit of Support. It will have to be signed and mailed to the UK the slow way. Get familiar with the form. When the NOA2 is received is a good time to finalize it with the supporting documents and get it in the mail.
Don't obsess printing Skype logs, emails, photos, or Facebook status. London does not want to look at that. Really they don't. London does not want to see a copy of your I-129F petition or NOA2. They got that in the file from NVC.

UK beneficiary:

Get some passport photos taken. You will eventually need
2 US sized for the Embassy
1 UK sized for the police certificate
1 either size for the visa medical exam.
(and for AOS in the US, 6 more US sized photos)
You can take your own and size it using this uploader tool from the Dept of State. Scroll halfway down the page. http://travel.state.gov/passport/pptphotoreq/pptphotoreq_5333.html Save the jpg file and print at home or at a photo place. Also available at Snappy Snaps, Photo-Me booths, Jessops, Gould's Pharmacy (by the embassy), near the Bond St Tube station (Oxford St) which is closest Tube to the medical exam.
Go to your NHS doctor and get the immunizations you will need for Adjustment of Status. You can get a K1 visa without having any shots, but you will need them before AOS. It’s really wise to take care of it before getting to the US so you can aviold civil surgeon hassles and $$$. Many NHS doctors will do them for free, but they are not obligated to do so for immigration purposes. If you had these shots as a child, Tdap/Td must be no longer than 10 years ago or you have to do them again. Get the shots documented by your doctor to take to your visa medical exam. Here’s the shots needed for 19 through 59 years of age:
Td or Tdap - Maybe not available in the UK, so get DT, DTP or DtaP and it will be accepted for AOS
MMR (if born in 1957 or later) Get a second shot 4 wks later if you have time
Varicella – Not routinely given in the UK ; a history of having chickenpox excuses you from the shot. They take your word for it at the visa medical exam.
Influenza - During flu season only, October 1 through March 31. This was a new recommendation dated November 2010 for all ages over 6 months. Older lists will say flu shots for over age 50. It changed.
Order your police certificate. It takes some preparation because you need a passport photo signed off on by somebody officialish who’s known you two years. Here’s the application. Read the instructions. A police certificate is good for 12 months. Must take it to medical exam. http://www.acpo.police.uk/documents/Application_Form.pdf
Look at your passport and make sure it will have 8 months remaining after visa issuance. If not get it renewed now. If you've damaged it or gotten it wet, it will need to be renewed.
Study the list of original documents London wants you to bring to the embassy and get those in hand or ordered. http://london.usembassy.gov/application_documents.html
Make photocopies of any document you want back. They will verify the original and file the photocopy.

Ready, Set, Go!! - Ask your questions or post your tips...........

Wondering about the Packet 3 you've read about for months in the K1 forum????
There is no "packet". That's old talk. Your instructions and forms are posted on the London website. You can start working on the forms at any time. London will send a letter to the UK beneficiary when they have received your file and are ready for you to apply for the visa. That letter will tell you to go to the website.
Here's where you start Instructions for Immigrant Visa (K) Applicants Applying for a Visa in London.
The forms are on the right. If you filled them in early, then you can post them off to London the day you get the letter. Don't send them before London has your case.
Here's the basics of what London needs to get before they assign an interview:

Visa application forms sent in by you to get in the queue. Only forms. No passport photos or documents like birth certificate, police certificate, etc.
Form DS-230 Part I and Part II
Form DS-156 (2 copies)
Form DS-157 (2 copies)
Form DS-156-K (Do not sign it. You will sign at the interview while the officer witnesses. It's an oath)

[*]Medical results. They arrive at the embassy by courier 3-4 days after your medical exam.
[*]Form DS-2001 Readiness for Interview with a cover letter- This is your way of saying you have gathered every document needed for the interview including the I-134 from your fiance. They are in your hands---not on the way.

Read the instructions on the website for what documents you need for the interview. It also tells about what info to include with the DS-2001 in the form of a cover letter. There are links in a list on the left side to learn about the medical, visa fees, courier, interview, FAQ. Sometimes the right side of pages give links "for more information". Click those too. There is a lot of information to learn if you will click links and read it all. Don't depend on a forum to give you all the info. We might leave something out. Best to study the source, then ask questions about things that don't make sense.

Thank you for this!