[harshy]

I'm not an expert, but you can see it on the actual channel however the iPlayer on PC runs at 720p for HD streams, rather than 1080 - whereas broadcast channels are closer to 1080p/i resolution if that makes sense. It's almost like the old days of 14:9 regions 'showing out' as it were on a soft opt by adding black bars to the picture...

That makes sense, thanks Mike, does look good the upscale although now the moire seems more obvious.