Re: HD & 4K formats. HD was invented by NHK (Japanese equivalent of the BBC) over 40 years ago but getting it to a broadcast system took nearly 30 years. There’s a lot of kit to upgrade from cameras, cables, editing systems all the way to the TV in your living room.
NHK also invented 4K and 8K. To adopt either of these would require the whole set of equipment to be upgraded again. Japan is considering just going straight to 8K to avoid this double upgrade. There’s no point in going past 8K as the definition is beyond what the human eye is capable of resolving.
It was only really with the widespread adoption of flat screen TV technology in the home that HD became a viable broadcast format. Going to 4K and 8K is more a matter of tweeking this technology than getting people to adopt a new one. It is very much chicken and egg: why broadcast 4K if only a few people can properly view it? But why buy a 4K TV if there’s nothing broadcast? Once the manufacturers have got the yield up to sufficient levels they’ll drop those models which are HD only and 4K will become the new norm.
The other potential blocker stopping 4k is that with the viewing distances most people have (compared to the size of their telly), it makes naff-all difference. freeview hd is currently pushing out 1080i (you might be getting 1080p over sky etc). Advertising 4x the pixels might help sell tvs (and the odd sky package), but in reality, its undetectable from the sofa. With a 55″ tv, the benefits (with 20:20 vision) START to become noticable @ ~12′ from the tv (which is probably close to UK average viewing distance?) – to start noticing the benefits of 4k you’d need to be 7′ away, and for 8k you’d need to be around 3′ away. As the beeb doesn’t really need to sell packages to a few elitists who want to claim unmeasurable benefits, I doubt we’ll see it here (on freeview) in the near future.