Regarding World Cup in UHD
You'll need a compatible 4K TV. The full list of compatible 4K iPlayer TVs is here, and it includes 2016, 2017 and 2018 LG TVs, 2017 and 2018 Samsung TVs, plus TVs from Loewe, Panasonic, Philips and more.
There are some notable absentees, including Samsung's 2016 TVs, which though they do support HLG, don't support DVB-DASH, the technology standard behind the BBC's adaptive streaming. Similarly Sony's 2017 A1 OLED isn't on the list.
If you have a 4K TV that isn't on the list, you do have the option of the Virgin TV V6 box. Interestingly, there doesn't appear to be support for live 4K iPlayer broadcasts on Sky Q, even though the Sky Q platform does appear on the list of supported devices for on demand (rather than live) Ultra HD iPlayer content. We're looking to clarify that with the BBC.
https://www.whathifi.com/advice/4k-b...tra-hd-iplayer