My interviewer got back to London and asked for FBI PCC in an email sent on April 16.
I have raised two CSEs asking them to confirm that they have to FBI PCC (delivered there on March 25). Otherwise I have to get a new one and it takes 6 weeks.
They did not reply.
Rawdah mentioned that once they have received documents they don't acknowledge receiving them. I guess they don't want us forcing their pace of work.
So they haven't received your PCC and they told you so.
But once they receive it, they will not tell you that they have.
Hope that helps.