[JMT1985]

Am the the only one who is riveted with this sort of discussion? Just me then.

Also, given the shots of the studio being a green screen environ. Has it always been a green screen since 2004 or has a blue screen been used.

Since 2004 it has always been green screen - the first green screen era saw a curved video wall, with the wall green screen, but there was the platform where the news readers walked around, and of course the desk area. 

When they ditched the curved video wall, it became a complete green screen studio in 2009 as part of the ITV News new look launched that November, and has remained a complete green screen studio since. 

It has never been blue screen as far as I know.