I've noticed this for quite a while if I'm honest but on my iPhone 6, iPad 2 and wife's iPhone 5 ALL on iOS8 (latest version), background updates for apps NEVER work?!
When ever I go to the App Store on my phone, in the 'Updates' tab, I always see a number of apps that just have the button "Update", next to them and I always find myself having to press on the "Update All" button at the very top of the menu. I get this on both my devices and also on my wife's iPhone 5. Why don't these ever update in the background (I have all the appropriate settings enabled)?

When ever I go to the App Store on my phone, in the 'Updates' tab, I always see a number of apps that just have the button "Update", next to them and I always find myself having to press on the "Update All" button at the very top of the menu. I get this on both my devices and also on my wife's iPhone 5. Why don't these ever update in the background (I have all the appropriate settings enabled)?