Thanks for all the ideas guys, but none work for us.
Our phones are constantly using the cellular data whilst in standby, the battery only lasts 5 to 6 hours and the usage & standby times are almost identical.
If we turn off the data it stops! & the battery appears that it would last for ever. For some reason it does not use the Wi Fi to do what ever it is doing.
I am sure turning off some of the things you guys suggest will help & we will keep off all the stuff we don't use. There is a major issue with this update & it needs sorting quickly! my phone used to be brilliant but now it can not do what it says on the tin. Apple have replaced it under warranty because of this but this new phone is just the same.
We even thought we may have had a rogue app that was eating up data so we removed them all but it was not that either.
Waiting for a fix
Rob (UK)