@keithzg @gemlog You know, I don't think I've ever seen an Attenborough documentary? I've heard they're good.
If I understand correctly, the BBC paid Sir David to make five episodes of a show; environmental charities paid him to make a sixth. The BBC is allowing people to download episode 6, but not broadcasting it.
Imagine the CBC paid for 12 episodes of #FrontiersOfConstruction and the Koch Foundation paid for a 13th. Would CBC be obliged to show it?