Right, i've just checked the discs from both the Ltd Edition and the Unlimited Edition...and the bottom line is... My Ltd Edition has an incorrect disc 2!
So, my apologies to 'Refused' as I was confident I had the right discs but ultimately, it looks like I was wrong!
Just for future reference, (for anybody that is confused as me), the discs in the Unlimited Edition are each labelled with the Cat. no of that release, FCD643, and additionally have an A on disc 1, B on Disc 2, C on Disc 3... But these are all ok, there is no problem with any of these!
The discs in the Limited Edition both have the Cat. no of that release, FCD620 on each disc, therefore I thought things were looking good...
Disc 2 in both sets also have the same artwork.
But, when I put Disc 2 from the Ltd Edition in I found that it does actaully contain the contents of disc 2 from the Unlimited Edition, which is of course the film again, exactly as disc 1, but in standard defintion, so it's obviously not just a case of disc 2 from the Unlimited being put into the Ltd as I thought was the case.
So, it looks like I'll have to get in touch with Arrow to obtain a corrected disc, hopefully they will accept a scan/photo of my store receipt.