GiffGaff is a no go... At least for me O2 sucks here and where I work
I've upgraded to 9.1 public beta. I'll report back on battery performance after a couple of days.
Me also. Seems okay so far. I have Music running in the background (though not currently playing) and haven't Force quit it and have 93% of battery with 33mins use and 3hrs 52mins standby.
The real test will be listening to music which I'll do on my way home tonight.
Looks to be exactly what we thought in that the connection to EE is causing the issues... With the CommCenter process going crazy