If I remember correctly, when BBC News HD launched, it was also on a higher EPG number, and it took a couple of weeks for it to swap to 503 (for those with an HD sub).
So that's almost it. Time for me to bow out and say goodbye.
Thank you to Asa for creating and running this place which has given me so much enjoyment over the years. Thanks also to the mods, and to all other forum members past and present who have made TV Forum such an interesting, stimulating, and unusually civilised corner of the internet.