iOS 8.4 will not download/install

I've tried to update my iPhone 5s with iOS 8.4 proper, from the latest public beta release. The over-the-air update has frozen at 'update requested' for a couple of days now, but when i plug into iTunes and try to update from there, it's telling me that I have the latest software.

the iPad general release was fine updating from the beta, but for some reason the iPhone isn't having any of it. Other than a restore, which I'm happy to do, does anyone know of any other fixes for this?