I heard about the McD interviews. However, I was invited to NIA HQ last year, and I understand that is the norm now. I was given three letters by SB: One for the embassy to confirm that my passport copy is true and correct; another one for the embassy to confirm that I have intention to renounce current citizenship; and one for the Khet (Amphur) to apply for a Thai name. I had to bring the three answer letters back to SB. The NIA interview took place while the answers from the embassy were still pending, the choosing of the Thai name was quick and easy and I had the letter but hadn't handed it in yet. The case was only moved to the MoI earlier this year after all documentation was complete at SB.