Yeah checked all of those initially with no joy everything was set at maximum, got it fixed now, all it took was taking everyones suggestions and cycling each one on and off a few times as well as the side mute toggle and all is good in the world. Next step was to reset the devices.
I searched apple support forums and all i got was a load of techno babble, asked on STW and its sorted in 5 mins.
Cheers everyone