I think you have to drill or hack out channels into the plaster of the wall and then encase the wires in a protective plastic sleeve of some sort before filling the channels back in with plaster and then re-painting (or re-wallpapering).
It's surely a jawb for someone other than me. I had a quote of just over a hundred quid when I first had the telly but I said no, thinking the guy would come back with a cheaper quote. He didn't ... .
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