In order for there to be 8K screens, there has to be a camera with the capability of shooting in 8K quality. Did you know that you can buy 8K Cameras today?
Cameras capable of doing such have actually been being announced since 2013, but it’s not until recently that better known brands have gone public with their plans for 8K devices.
Canon announced their Canon Cinema EOS System 8K in September 2015, and Panavision announced their Millennium DXL in May 2016. Other brands with cameras capable of shooting in 8K resolution include Hitachi, RED and Ikegami.
We’d advise you to check out either Currys or Camera King to check out the latest UK offering of 8K Cameras.