The BBC isn't a government body and isn't funded by taxes, it's primarily funded by the license fee (and selling broadcasting rights overseas).
The internet has royally fucked the funding model - as everyone and their mum has equipment capable of receiving live broadcast tv, but unless it becomes an official government mouthpiece it's unlikely to become something we pay for out of taxes.
It's not a government body, so it can't be official. The closest it gets is unofficial mouthpiece for the British Establishment™.