Hi PhilCal,
Well that's not good at all. I'm wondering how much cork you have lrft on your Land Roll clutch plate. The only way of finding that out is by undoing the nut that you can see about halfway down the clutch fork which is the part you are attempting to adjust.
You'll have to remove the drive chain that supplies the motion from the cutter sprocket and the undo the centre bolt and nut assembly which will then free the outer pressure plate. Do take notice of the position of the nut on the thread and roughly how many threads are protruding from the nylock nut as when you put it back together it will be crucial to have that centre bolt correctly adjusted.
Honestly I wish I could just come and look at it myself as I find it so much easier to look at an issue personally.
Cheers,
BB