I did the super techy thing of submitting your second sentence to a Google search, and got this "AI Overview", followed by a string of some offerings from more specialised forums. Submitting another selection might lead to some different hits.
"To fix sound loss when switching to a Virgin Media box, change the audio output settings on your TV or box from "Auto" to PCM 5.1 (or stereo) and set the TV's digital output to Bypass. If that fails, check for HDMI-ARC/CEC issues, ensure cables are secure, and power cycle both the TV and Virgin box."
I'd try some of that, step by step, and also see if anything else suggested in the other search finding look possibly relevant to your situation and at the right technical level for you. Be wary of false positives of course -- people confident that they have the right solution because it worked for them.
I'm grappling myself with a difficulty one particular computer has with usually getting its HDMI audio output audible via one particular tv: next stage is to try a trial implantation into it of an EDID file telling it what formats the particular tv might reasonably be happy with.
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