I understand that; my point was that on the UK system the older productions aren't actually transmitted with black space to either side, but the sets are triggered automatically to display them like that (though if you want to override it, you can get your set to streeetch every image into widescreen if you so choose), so I wondered if there was some difference between the two transmission systems that meant that couldn't happen in the States, so the the broadcasters had to decide whether to 'sidebar' or stretch at source.