Yes it's a V6 box
Very strange as it happens to be working... all of a sudden. However, the only thing that is working is the main TV. I go into 'guide' and all the TV programmes show including the preview in the top right-hand corner. So sound and vision working.
What isn't working, at the moment, is the on-demand service whether via the Home screen or via the main TV menu i.e. scrolling back to watch a programme you've just missed.
I shall leave the V6 box on and check again later. Perhaps that's what the box needs, just to be left on.
Many thanks and I'll keep you posted.