connecting to surround sound

You would actually want your hd box connected to your xbox one then your xbox one to your surround sound and then the surround sound to the tv. this way, your tv will display the picture but your surround sound will intercept the audio. the surround sound
works as and audio/video in AND out device. Your sky tv wouldn't connect to the xbox at all as far as I know, that would have to be plugged in directly to the sony surround sound and you would change the input on the surround sound rather than the tv.

Here are some cool diagrams to setup your home theater system

support.xbox.com/.../connect-sound-system

support.xbox.com/.../connect-console-to-home-theater

Apparently both the XO4 and XO7 are both tuned for stereo and surround sound. But it seems that it's Microsoft who are currently restricting surround sound.

These headsets get the game sound by just connecting to the headset adapter and the controller. No connection to the console is needed. These headsets will accept whatever signal is sent to them from the controller, at the moment, Microsoft is limiting that
to just stereo. If Microsoft update to send surround sound, then these headsets are ready for that.

Hopefully that makes sense

They added Dolby digital 5.1 in the recent march update so the optical surround sound should work the way you are connecting the base station. Try re-pairing the headset to the base station or check if you have dolby digital selected and not a PCM option.

Advice for your surround sound system: If you can, always connect the optical sound from the source device (xbox) to your surround sound system. This will prevent any delay an extra device (your TV) may impose upon your audio since its going through one
decoder (TV) to another (surround sound system).

They are definitely forcing users to buy HDMI surround sound equipment to consolidate the HDCP dilemna. Too bad they don't realize gamers use headsets

This is how I have mine physically setup.

XboxOne - HDMI to the "Game" Port on the receiver

Receiver - HDMI From Video Out to HDMI Port on TV

If you're doing everything with HDMI then ditch the optical cable. If your Blu-ray player is also a surround system, then you need to have your xbox go into the blu-ray's Input port. From the Blu-ray's HDMI Output port, go to the TV. Programming is all that
should be left.