Made some more progress!
Remove the allen key bolt..
[Linked Image from i304.photobucket.com]
Then I slowly worked the pulley off with a couple off screwdrivers.. Its off!! Finally smile
[Linked Image from i304.photobucket.com]
Then remove these bolts either side of the mower..
[Linked Image from i304.photobucket.com][Linked Image from i304.photobucket.com]
Then the roller simply drops down..