Hello. I have a flight in a few days that should see me move from blue to silver

But I fly the day before my membership year ends.

In my experience, it normally takes at least 24 hours for miles and tier points to show up on my membership page.

In short - does this mean I am stuffed? I can hear the calls to BA now - with me insisting that as the flight was within the year, it should count - but BA insisting that as it showed on the system the day my year ended (or later) it will not.

Perhaps I have been speaking too much to my bank lately and have turned cynical as a result. But I find that these days, when the computer says no, you're toast.

Thanks for any help.