Soundbar works with Sky Q remote but doesnt display volume on screen

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I suspect there is an easy solution but google doesnt respond with anything too relevant at first glance.

I acquired a cheap soundbar which I plugged in to the tv using hdmi arc. Straight out of the box the tv has picked it up and defaulted to it and the Sky Q remote allows me to adjust volume on it. However nothing is displayed on screen to indicate volume levels where previously there would have been for the internal tv volume. I havent done anything through the sky box to tell it that there is an external sound source - on my old sky box I had to put in a code and do some pass through thing - I forget now.

What do I need to do so that I get the on screen display? Sorry if this is a daft question, I'm tired and when i didnt get an instant answer i posted here!

 

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Of course as always you are absolutely right! The TV settings are correct for an HDMI sound source etc. On reflection the last time I had a soundbar it did the exact same thing but it had a physical digital display on it so I could see the volume that way.

TV is a Philips 50PUS6704 Ambilight and the soundbar is a hundred pound thing that came free with it, Philips HTL1510B. I wouldnt normally even bother but since it was there anyway I thought I would stick it in as a stop-gap until I can get something more appropriate (Ive discussed what I ultimately want with you before I think!).

I suspect on reflection if you plug in a £100 soundbar (free or not) you get a £100 soundbar!!

 

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Crap soundbar is crap in other words! Oh well, back to the drawing board! I think the old Sony one is out in the garage, I might dig it out for now.