[Mute]

Can somebody explain to me the technical reasons why the Tivo EPG can't dynamically be updated for schedule changes, as we are seeing at the moment?

When TiVo was originally developed it was a standalone product designed to work alongside existing TV platforms, but independently from them. As a result it used its own program guide data downloaded over the internet rather than the data broadcast via the TV platform (which wouldn't have existed in the days of analogue anyway).
Even though TiVo is now more closely integrated into various TV platforms it still uses the mechanism of periodically downloading it's own listings over the internet. I'm guessing that changing such a fundamental part of the way the software works is too difficult. Originally this happened once every 24 hours, but with the version that Virgin Media runs this happens every 6 hours, although you can force it to happen at any time.
To complicate things a bit more, the program guide data is supplied by a third party and not directly by the broadcasters. So no only do we not get real time updates, the listings have to be processed by another company that sits between the broadcasters and Virgin Media, delaying things even more.