Digital TV is great. We keep being told this. Loads of channels and fuzz free pictures. But the reality is not always the same. I've been watching the London Marathon on our telly, via our digital satellite channel. Now things like marathons give compression techniques a really hard time. A whole screen full of runners means that everything in the picture is changing. And the screen collapses into blocks and colours as a result. In my opinion the old steam analogue picture is much better. We are just about to see the launching of a new high definition service in the UK. With a bit of luck, it might be almost as good as the original one.