1. Yes, I had restarted the V6 box several times.
2. I access YouTube via My shows as there is a link at the bottom of the recorded shows list.
3. YouTube works on everything else
4 The problem resolved itself after about a week. It's now all good.
Thank you for your responses, it is appreciated. I apologise for the delay with my replies, work gets in the way sometimes.
Cheers
BriC