My little mistake was on the re-assembly of the rear slide bearing.
Here http://s699.photobucket.com/albums/v..._0887Large.jpg
It has 4 shim washers and on re-assembly I could not fit the fourth one in behind the 'E' clip on the very end to the rod. I think I may need to turn the other 'E' clip around 180 degrees to give the correct clearance.
The result of this error is that the pistol does not fully lock when the slide is moved forwards after shooting. That tiny shim makes all the difference!
The engineering in these really is amazing.
Thanks
Mark