Thank you so much for your quick response. I also think that's the best course of action. Out of curiousity, in the event that he should go on the trip and try to enter with the certificate of naturalisation, what ramifications could that have and what ramifications would there be if he enters the ...

Friend who is a Panamanian national obtained British citizenship on July 11th, 2017. He has an upcoming trip to Spain in mid August and then we're meeting in Moscow in mid September (I live in US). He called PassportAdvice office and was advised that they could not guarantee an interview and/or a ...