Maybe the forend was changed over ? The 'spare forend is marked up "134" but the forend on the rifle is not numbered. The 'spare' has no damge or splits / cracks so maybe the Police Marksman just liked a slightly different (fatter / slimmer ?) forend and it was changed.
Pics below are the numbered spare forend.
As usual appreciate any comments.
http://i161.photobucket.com/albums/t...d/DSCF0053.jpg
http://i161.photobucket.com/albums/t...d/DSCF0054.jpg
http://i161.photobucket.com/albums/t...d/DSCF0055.jpg
http://i161.photobucket.com/albums/t..._enf_28829.jpg