I have just read Superman & Narfstar's comments on this file.
I looked at my original again and the double pages were quite clear.
The problem is entirely mine as the original file is over 100mb (tried to upload but kept getting timed out) so I decided to resize.
Stupidly I resized the doubles (Width 577 - Height 800) the same as the singles, resulting in a much smaller size than the single pages (I hope that makes sense).
I have sorted out the sizing problem and the relevant pages are now hopefully clearer, however they are still not as clear as the originals, but I don't know how to solve that. So any suggestions gratefully received.
Thanks to Superman for pointing out the error.
Re-uploaded today.
Graeme