I haven't watched anything on BBC HD for ages but someone just told me the bitrate dropped. "Surely not!" I cried, not when Sky just boosted theirs... Sure enough, it's at 16.4Mbit/s, down from 19.24Mbit/s. Looks like it happened a few days ago. I would be disappointed if this was a sign of things to come, or perhaps they're just playing around like they did with Freeview (I believe they dropped 1080i to a similar bitrate back when they did their tests there, while testing high/low bitrate 720p also).