Would you be able to postpone the interview? Can you get any confirmation that they've received your request for a police clearance? I had to wait almost four months for a foreign police certificate to arrive, but I would not have been able to succeed at the interview without it. They asked for it directly when I said I'd lived abroad for over a year. I'm not sure if it would be different elsewhere, but I'm glad I didn't risk it, even though the wait was so long.
