Thanks, found this via the vbulletin.org site!
It's neither I'm afraid, it was mid-show and it's definately not the TV as I have got it as an MPEG I took from a DVD I recorded it on.
Here's the clip to demonstrate what I mean:
http://www.steadiforum.com/wide.mpg
I did show the TW tech this, but he couldn't think of anything to hand, but nothing has ever come of this, but the problem still exists.