BG
Thanks for the input
How far in advance you make the check is something for which there is no hard & fast rule. These days as soon as disaster strikes an Emergency TRA is slapped on to keep the press helicopters at bay.
If there was say a rail crash at 23:00 with a TRA being imposed at 23:59 and you bimbled into it at 15:00 the next day "they" might wave the big stick. On the other hand a check the previous evening for a flight starting at 09:00 might well be considered reasonable.
One hopes that something of that ilk would in any case be broadcast on the FIS and by nearby ATC units at regular intervals.
NavAids do go out of service. There was a fatal accident where the AAIB found the pilot was relying on a VOR that was notammed as out of service and flew into high ground.
So I suppose the answer, as with the weather, is to work from the most up to date info that you can reasonably obtain.
Microsoft Word has a useful tool under Tools/Track Changes/Compare Documents which would allow you to quickly compare the brief you downloaded and checked last night with this morning's one and highlight the differences.
Mike