Per Bazza you can spend less money and get "better" sound or the same and get "much better" sound but ......
I am a huge Sonos fan for its all round convenience.
We have a setup in one room with a Playbar and sub and it is really very good. Of course not only do you get the TV sound but access to the wider Sonos infrastucture covering your own ripped music, internet radio, Spotify, Apple Music, amazon and just about any other streaming service you can think of. You can also of course add two Play One or Play 3 as rear speakers at any time for a 5.1 set up.
Some things to consider , Your TV must have a digital optical out as all sound signals from any input sources, Skybox, DVD, streaming box etc all route through the TV via their HDMI and then back out to the Sonos Playbar via digital optical. Also the Sonos can only decode up Dolby Digital, it won't decode any DTS only discs you might have and wont ever support any of the newer HD digital formats which are additionally available on Blu Ray and 4K discs etc. If these are important to you (and to most people in their normal living room they areant) you need a lot more speakers, an amp etc etc.