ok so this is clever. The audio description doesn't replace the existing audio, it's added on top. how on earth have they done that?

I mean I understand that they send it out on a separate channel for freeview already, but unlike everywhere else on the web, this doesn't appear to be a single feed.

@cachondo tbh Sean, I didn't notice any of that, I'm just glad they have AD on live programmes on the web iplayer, and not just the digi tv.

It's a very welcome update to be sure, just fascinating from a technologies point of view too.
I could be wrong about what they're doing, I've only listened to it briefly.

it's just great to be able to listen to Ad stuff on the pc. I do have a tv, but rarely fire it up now.