Ok so with some cleaning kit I managed to remove all but 1 spec from the viewfinder sans focusing screen.
As soon as I add the screen though theres a ton of marks, i have cleaned it best i can but even my untrained eye can see that its been damaged
arses!!
Still camera works fine, just got a few marks in the view finder, will get a replacement focusing screen (sub £30) and carefully install that, hopefully will remove the worst of the issues.
Mirror looks clean as well.
Also the sensor appears to be clean as well.. theres no obvious dust i can detect on the images i have tested with (blank white)
http://www.ebay.co.uk/itm/Genuine-Canon-Ef-A-Focusing-Screen-EfA-Digital-Camera-EOS-40D-50D-60D-/300626237236?pt=LH_DefaultDomain_3&hash=item45feb85734