I am an idiot and posted this in the credit forum before I realised that this one was here:

http://www.creditboards.com/phpBB2/viewtop...6890&highlight=

The latest update is that up until now - due to my dispute I guess - the second "newer" tradeline had been suppressed. Tonight when I checked Credit Manager (Experian) it had been added back on and my score dropped 5 points! This is the only difference so I know it affects the average age of accounts! Does anyone know how to get them to report properly?