[Neil Jones]

This is related to this discussion, it came up in Tom Scott's weekly email:

Part of the challenge in reducing latency to match that of traditional broadcast is that changes are needed throughout the distribution chain, from streamlining the process of getting video and audio to our encoders to reducing the amount of buffering used by the streaming client in your TV.  Along the way, there are changes needed to allow the media to flow more progressively through the content delivery network.  And all this depends on agreeing industry standards so that there is a common approach that everyone can support and tests and trials are needed too to ensure that it works across the different kinds of TV and other streaming devices that our audience uses.

...

However, challenges remain to deploying low latency at a large scale.  ... whilst those issues may prevent our streaming latency reaching parity with broadcast for some time yet, there are still some things we can do in the meantime. 

"some time yet" would suggest they think they may be able to crack it by 2030.

www.bbc.co.uk  has an overview too.