Where's the standard definition version of tonight's show on BBC Iplayer? Only the HD version seems to be there.

yeah, my computer is old and doesn't like HD so I had to try and watch it with the picture stopping and starting, it was too annoying.

it took me forever to watch because it was HD

I had that problem at first but if you look under the screen, under where the show's title is written in pink, on the right you have an option to "watch in normal quality" (next to the download button). Click on that.