I was just about to say that's a bit strange, as mine is still it's regular navy blue.
On the topic of BBC newsreaders, IIRC, the protocol is no longer that they need to wear black, provided what they are wearing is relatively sombre. I believe they also have black ties for the males kept under the desk, so the changeover wouldn't take long.
EDIT: Another thought. Any royal death announcement would be embargoed to ensure all commonwealth leaders have been contacted. There's a good chance the news organisations will know about a royal passing for a while before it's released to the public. As such, the news channels would probably get a senior presenter ready to go on air with all black clothing.
