I noticed that **inshaala** suggested that I should,

look at my most recent upload

Thanks for telling where I could get the image in question. 

I downloaded it from your gallery and saved the jpeg.  I then opened it
in Photoshop 7.  I got a warning message about the embedded color
profile "Adobe RGB (1998)" and chose to use it.  I then converted the
image mode to LAB -- this allowed me to check the 3 channels (Luminance
(or Lightness), A, and B)

There was no information in either of the channels A and B ... therefore
no color was present in the image.  ... and you can quote me to your printer. 

My best guess as to the cause of the problem is that they have either a
convergence error or an astigmatism problem in their printer. 

I have a friend who services photofinishing equipment -- too bad that he
works in the area near NY City not in the UK.  LOL

--
Martin