I just fired up my trusty HDR1000S and while looking in the TV guide, I found that HD channels had replaced some of the BBC channels slots. 102 was now listed as BBC2 HD, along with 106/107 BBC 3/4 HD and 200 BBC News HD. Here's a couple of screenshots merged.
I've often wondered if this would/could ever happen, but I certainly never did anything to instigate it.