Overall they were very friendly. Maybe he was surprised because we found the information about it. The instructions for London embassy on travel.state website didn't mention the financial support and the form I-134 for DV winners, only the form I-864 for family based immigration visas. But, as I mentioned earlier, I found one more checklist and I'm following your guidance as well. I'll share my interview experience here and on your blog, once I see status "Issued" on CEAC website. The links to the two checklists for London embassy: https://travel.state.gov/content/travel/en/us-visas/Supplements/Supplements_by_Post/LND-London.html.In your face - Consular Officer!!
https://uk.usembassy.gov/wp-content/uploads/sites/16/2017/06/iv_and_k_interview_checklist2017.pdf
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