CRT TVs were invariably repairable. A CRT TV has a lot of discrete components. A component failure did not write-off the TV despite a bit of labour involved particularly having to resolder everything in sight.
LCD & Plasma TVs are invariably not repairable. An LCD TV is Panel + Processing + Backlight + PSU, and that is about it. Of those PSU & backlight are replaceable if you have a branded unit - on cheaper TVs it can prove difficult to source the parts rendering it landfill..
So look for a TV with free 3yr or 5yr warranty, I say free to the extent of paying =A329 or =A375 - but not the overpriced high street warranties. A flip side is that in 5yrs it may be out of date, but alternatively not everyone wants to spend =A3300-500 every 5yrs.
Panel type matters if you are viewing from below the TV or around a room. TN panels do 6-bit colour with limited viewing angle (contrast lost & colours go AWOL), whereas (S-)PVA & (S-)IPS do 8-bit colour with wider viewing angle before suffering degradation. If you are used to CRT, no LCD is a perfect replacement - the top ones are good on foliage & particularly sea scenes, but not so good on dark scenes & human face colours. In particular the cheaper panels can do quite poorly re dark scenes & suffer backlight "spotlight casts".
Plasma do a lot better, there used to be a good Hitachi unit quite cheaply at Richer Sounds. On plasma you really do want a free 5yr warranty - they run hotter, consumer more power, more dependent on active cooling (fans).
Check Online, Richer Sounds, John Lewis, even the local supermarket.
Samsung have good picture, the smaller end models can have diabolical sound (3W mono cassette recorder). Toshiba have good picture, not so good sound. Hitachi a bit better. Sony & Panasonic better. Now gone Pioneer plasma the best at a price to match. No-name can be variable. The better models have better sound, not just better picture BTW.
Shop LCD are rarely set up correctly. The most immediate thing to change is the noise reduction & sharpness settings, too high a sharpness setting and it looks like a jaggy grainy jiggery computer image. If you can see motion judder you need a better TV, some cheap TVs suffer it quite badly on motion and even the major names can suffer it slightly on slow panning of foliage scenes. Some people are very sensitive to it and once pointed out to them or noticed they do not like it.
Look for Freeview HD if you want to avoid another box. You can often pick up last years models very cheaply, eg, Asda & Sainsburys, however check what the specs are. A while back the typical cost-cutting was a cheaper panel or cheap sound or one HDMI input. Today another item to check is no Freeview HD built-in.
Tesco Direct is another good source - and check on Ebay because they have a refurbished store. I think they do various LG & other TVs are heavily discounted prices, refurbished, 12 months warranty. LG are Lucky Goldstar of Tottenham Court road fame in the early 1980s and slightly below Samsung, although both LG & Samsung PSU designs are a weak point (on anything).
Amazon UK website is a good place to read reviews, just read the bad ones first because they are often from people who can tell the difference between a junk TN panel and IPS panel rather than someone who just stuck an Xbox on it.