For those interested, here are some technical schematics that show the way transmission chains work for live programmes.
Here's one for Good Morning Britain when it came from the Southbank. I have blurred certain sensitive information out:
And for programmes that use satellite as their TX path, the below is from The BRITs a few years ago:
As previously mentioned, most FTA content is unencrypted. If you have a steerable dish and can get access to a feed early in the afternoon on TX Day (i.e BRITS or BGT), you'll probably get a glimpse at the dress rehearsal and some other not-for-public goodies.
I'm working on getting access to a few programmes and sharing the talkback - unfortunately this needs the permission of the gallery, including the director, as well as senior team members such as the exec producer but I hope to bring a glimpse of a live gallery at some point soon.
I believe there are clips of X Factor and BGT from the Fountain days that are circulating online - including talkback gold featuring a very annoyed Jonathan Bullen (the director).
Views are my own and not that of my employer!