I am after a new telly and the spec and choice there as well is bewildering
Quite true, but there is a way of drastically reducing the range of choice these days. Loudspeakers have always been a neglected part of TVs, often little more than a design afterthought with consequences on sound quality. That's especially true with todays flat screen TVs, some of them with very poor sound from small speakers crammed in at one edge or at the sides.
So if decent sound quality is at all important to you, do some channel changing in a large store with plenty of set choice to try, seeking bits of music to check the sound quality. The ads on commercial channels often have bursts of music, or try punching in the numbers for the BBC's predominantly music freeview radio programs, 701, 702 and 703 for Radios 1, 2 and 3 or your favourite radio channel. You might be surprised at how poor some of them are in comparison with others, and with the choice narrowed, you can finally judge on picture quality.
.