This seems incorrect. The OP said s/he had got his first British passport ALREADY, so there was no such an issue with "foreign passport" (even if s/he had one).
OP, how did it go?
ESC
Welcome to immigrationboards.com!
This seems incorrect. The OP said s/he had got his first British passport ALREADY, so there was no such an issue with "foreign passport" (even if s/he had one).