As your signature says England I suppose your system time is set to GMT. Do you have DST there? Is there a chance your system is in DST? What does exactly it shows as the time? Like in
this page it shows "Rubberband at 8:00 UTC-3". To capture local time a javaScript script is used and it is dependent on the system time settings.
That is to say the latest update (as I write this) was timed at 12:00 GMT...the update is timed then
I think there is something wrong. The time at the top of the page (is it what you mean by "timed"?) should be 11:00 UTC. Since it shows correctly for me (8:00 UTC -3) I can only guess the javaScript script has a bug or your system time is misconfigured. I don't use Windows but I know it used to have some quirks.
I think you know but just to be sure: The update finishes at about one hour after the file header time just by coincidence. The file is available at about 39 minutes after the file header time and the rest of the time is processing time. BTW I will upgrade the server memory in the next days and I hope that will shave a few minutes from processing time and make some queries a bit faster.
I know you got something but I can't figure out what is it. Point me to the page where you see it or better, send me a screen shot to admin at fahstats dot com