YEAH - A BIG THANK YOU GUYS!!!!!!!!
Yep it was me being really, really stupid
It is as easy as Virgin says it is, I wasn't changing the source/input to HDMI so thanks to you all for your input (pun intended)
I just told my sister and now she wants me to go and do hers, she has a Sony Bravia and can't get HD on it - at least I've got an idea of what to do now
Thanks once again