Still can't get this to work so I'll list what I've done in the hope someone can tell me where I've gone wrong:
Created a folder called comps in C

Program files\Sports Interactive\Football Manager 2007\data
Copied the fixtures above into notepad, corrected the error and saved as eng_prm_11.cmp within the created comps folder (file is now showing as a cmp file)
Used notepad to open C

Program Files\Sports Interactive\Football Manager 2007\data\panels\nation filter.xml
Deleted all text and replaced it with one in thread above. Saved file.
Now when I start up a new game I can't see any option to select real fixtures and don't even have a greyed out box.
Have I messed up somewhere along the way?