Thanks. I was going to phone the FBU on Monday - we'll see where I get to! The email address you mention no longer elicits replies (well, not for over two months now). When I was making general enquiries about my eligibility in March, they replied quite promptly
AFAIK they are closed on Monday - see opening hours below.
You may already know this, but to call FBU, there are two numbers you can try (as per my post, though, neither has worked for me for the 8 months, during which I have definitely called over 100 times).
020 7891 3926 then press 1
020 7499 9000 then xt 23926 then Press 1
If I recall correctly, you can call either number, and then as soon as the recorded message kicks in, press either 1 (first number) or press 23926, wait until you are put through and then press 1 (second number).
Their (supposed) open hours have been reduced to Tuesday and Wednesday 930am to 1pm. They are also closed on various training days, all UK bank holidays and all US public holidays (so, pretty much any day that has a "y" in it). Even at times when I thought I had got through and was put on hold, the hold tone would eventually cut out and I'd hear once again the recording, "The Federal Benefits Unit is not open at this time ..." <<argh>>
Good luck. Please post back with progress.