"No changes to digital, we are only switching off analogue". Lies, lies and more lies.
Yeah you keep quoting that, so where exactly did you read these lies?
There have always been plans to change digital during the switchover. In fact that is pretty much the entire point of the switchover.
You haven't explained why we need to re-tune digital equipment when all that was being done was the switch off of analogue (or so we were told).
They are switching off the low-power digital signals as well as the analogue signals. Then they consolidate into fewer high-power digital signals, thus improving the signal and freeing up some of the radio spectrum for other things like wireless broadband, IPTV and HDTV.
While they are doing all the switching about you might sometimes get a better signal from another transmitter.
I'm not sure how much more of an explanation you need, but there are plenty of technical details available if you still think it is a space-lizard conspiracy to make you re-tune your TV.
Don't ask too many questions, the State won't like it.
I think you might be a bit mental.