Thanks, it looks like these drivers are for 14.04 and not 14.10.
In the meantime I've made progress, it seems I needed to change the AV mode on the monitor to off, as per here Samsung 2494HM Resolution problems. This addresses the cropping problem and resolution and colours now look pretty good.
However, the display still shows up as being 7". This is good enough for now. I'll come back and try the drivers once everything else is setup.
Intel drivers for HD Graphics are included in the vanilla linux kernel.
Meaning that currently you dont need to install any additional drivers through 01.org because the latest are already included when running 14.10.
This will change once 15.04 is released, then 01.org will include backports for 14.10 and older (that is drivers from 15.04 will get backported onto 14.10 unless you upgrade your Ubuntu installation into 15.04 because then you are back to the latest available drivers again).
You can join #intel-gfx on freenode to get hold on the developers who can help you more than I can with your issue.
If possible can you use other output than HDMI with your Sony TV (Im thinking if there is some bug in the Intel driver on how it interprets the HDMI information from your TV, compared to if using your minidisplayport output instead?).