It's interesting though that the current ITV theme is off a production album and that means anyone can use it if they want. Perhaps they want something of their own that other's can't use. Although having said that the same applies to Channel 4 News - the original of which was just off a Bruton LP.
Interesting you should mention that, as I was wondering if there are any restrictions on the use of library music. For example, would there (legally) be anything to stop a BBC programme from using the ITV/Channel 4 News music? Obviously it wouldn't be particularly practical, though, as it would look like they just stole someone else's music!
I know I've heard the Channel 4 News music as the bed for a radio ad for car alarms or something in the UK!
The ITV News Theme was used in Season Two of The West Wing as the theme tune for "Capitol Beat". Just a happy little nugget of information...