Found the source, courtesy of POWERStarz2004 on Digital Spy.
https://www.freeview.co.uk/psb-lcn-rules
The same poster mentioned this PDF that apparently discusses the moving of Freeview to having Genre Categories.
https://www.freeview.co.uk/sites/def...els.pdf
---------- Post added at 17:33 ---------- Previous post was at 17:26 ----------
Seems the PDF is a response to the consultation from a member of the public.
---------- Post added at 18:13 ---------- Previous post was at 17:33 ----------
The article, the first link, is notable for a couple of other reasons.
1) it's dated tomorrow.
2) it says BBC4 is on Channel 55 in Scotland, which it isn't, it's 68. Another temporary jump up the EPG prior to 4th November?
And I just noticed just before I pressed Post they've removed the page from the Freeview website, so it was clearly published a day early by accident.