everything goes into my AV amp so out of interest I took my hdmi straight from my V6 box into my tv with a new hdmi lead thinking my amp may be at fault, the picture was fine. Connected all back through my AV amp with new hdmi lead and hey presto all working again. I hope this may help someone.
It does seems strange that the ‘faulty’ hdmi lead was passing sound and menus etc fine but not the selected program picture? But it’s all working ok now