Got a few extra pics of the bellhousing and release mechanism:







I've measured the travel of the slave cylinder, which is 13.1mm from clutch pedal fully up, to fully down, and then had a mess around with some of the figures for the length of the arm out to the cylinder and how it will affect the stroke at the release bearing.




Now that i know exactly what effect it will have either shortening the arm or moving the pivot point i need to decide how to tackle this, obviously cutting a section of the arm out and welding it back together is the easy option, but the most i can shorten by is 10mm before bits start interfering with the bellhousing, this will increase travel at the bearing from 7.15mm to 7.86mm.
Moving the actual pivot point out 15mm will increase travel from 7.15 to 10.34mm, but thats going to mean making a bracket or something similar to move the ball pivot outwards, then cutting the socket out of the arm and moving that the same distance and welding everything back up. quite a bit of messing around, but it looks as though thats what will have to be done to get our clutch to clear fully.