I suspect the idea of calling R7 R4 Extra was one of those "They won't notice R6 aka 6Music is missing" ideas, else there'd be a gap between Five Live and Radio 7 (previously BBC 7!)
Have been meaning to comment on the repeats of damn "history in 100 objects" (3 times in a day is at least 1 time too many).
Also hate stopwatch radio (whether it is forcing some interesting correspondent from another continent to wrap it up at 02:59 before Five Live has the 3am news (as if it matters if it is 5 minutes later, after all it is 3 AM for heaven's sake, not like anyone needs pip-pip-pip-peeeeeeep accuracy on Five Live in the middle of a 4 hour 'Up All Night' show, unlike BBC World Service, where they have everything mapped out to the minutest detail).
Did anyone hear the tosser plonker idiot on Feedback at the weekend not answering why they are happy to cram the weather into 20 seconds, but appear unable (/unwilling) to drop a damn trailer that can be anything up to 60 seconds.
With they could have had Paxman on instead of Roger Bolton for that editor - he was more slippery than most politicians when it came to avoiding the darn question... and RB did ask him several times if they would, in future, drop the trailer and let people continue to talk!
So I avoid Today (one bit of "stopwatch radio") and even PM gets the same treatment with a trailer at 17:30. Don't they have enough of the buggers - from 05:21 to 00:30 they fill the schedule with promotions for TV Licencing, or some 'coming up' programme (up to a week ahead, usually the day after the previous show went out!)