Here's De Frutos in The Guardian on the pulling of the work:
In it he acknowledges that it was only appropriate for post watershed, and as I suspected, when commissioned the BBC thought because it's dance (or ballet, it seems they thought, showing a depressing lack of knowledge of wider dance forms) they assumed it would be anodyne, & safe for all the family, so always thought it would be pre watershed and scheduled it as such.
Regarding the question of pious, appropriate Television viewing fayre for Christmas, and the need to safeguard the moral landscape of society by completely censoring all broadcasts pre and post watershed. I'd just like to point to the fact that part of the Xmas programming for terrestrial television on Channel 5 in the UK, and thus publicallly accessible to everyone of the 60 million residents of the UK is the Exorcist. The full version with nothing cut out.