Not to start a whole flamewar over this, but it adds to confusion when it would look like another word like "Aids". Even their own final rule says not to do that.
> There are a few exceptions:
> Seasonal Affective Disorder becomes SAD ("Sad" would be confusing)
> Where a capped-down acronym risks being misunderstood as a word.
And when I say "should know better", a news organization, especially a place as respected as the BBC, should try to reduce confusion wherever possible. And as a matter of politeness, when it is an organization/person's name, it should probably cased the way they chose to name it, like "NASA" or "e e cummings".