Well I made a booboo. I didn't read the rather large small print about needing Windows 8 Pro to qualify for the free Media Centre upgrade
£24.99 gets me a Pro upgrade from any previous Windows version back to XP, or £49.99 gets me the Pro pack to upgrade my Windows 8 normal version! I wanted a completely legit clean install on this machine but they aren't making it cheap or easy. Think I'll drag out an old MSDN-AA licence and pay the £25, I
should be able to move my Windows 8 normal key to a new machine in the future.
At least all the hardware is running well, no dead ram or other silliness. Looking a bit lost in my chunky Antec Fusion case!