Caught a bit of the dance movie on BBC HD channel last night on my non-3D TV. Obviously it was side by side, but the red button facility clicked it into a normal picture without losing the HD. It didn't divert the tuner anywhere else. Never seen this before. Obviously this opens up the possibility of using the channel dual purpose for both types of presentation. I was using a Panasonic 24" TV.
BTW the plan is to change the BBC HD channel to be BBC2 HD. Not sure if/when this is due to happen.