Hi there, on the US gov. website there is a useful 'prepare for the interview' page for DV selectees: http://travel.state.gov/content/vis...visa/interview/prepare-for-the-interview.html
In the '2. Review U.S. Embassy or Consulate Interview Instructions' section you'll find a drop down menu with the list of embassies where interviews are arranged. Select London, and read the .pdf which contains specific instructions regarding the courier service of the London embassy with the website address where you need to register.
At the embassy you need to hand in the copies, translations if needed and the originals as well for review. You get back the originals after your interview, they keep the copies.
They only asked me about my education and I had to show proof to make sure I had the appropriate level of high school (think UK A levels or education after which you can go straight to university).
Hope it helps.
Hi Sunshine15 , Many Thanks.....