Well... my first post was "sketchy" as I just wanted to find out if anyone else had a similar problem. I am going to investigate the warranty (2 years on display).

Just for clarity, especially considering JiK's post...

TVs purchased Sept 07. One in my house. One in Mum's house. The horizontal white lines across the screen cover the top 4" of the screen. Portions of the lines disappear depending on the colour. As both TV's began to have this trouble at about the same time, I wondered if it might be sommat to do with the New HD stuff.