Thanks for the advice Chris, repair completed. The ball joint had popped, because the LPG loom had got caught up in mechanism. I removed the scuttle, released the wiper mechanism fixings, stripped cables out and spliced loom together, replaced wiper mechanism fixings, refitted ball joint, replaced scuttle and replaced LPG main fuse. Job a good one. Thanks again for the tips Chris and the help of OOF's Maintenance Guides - Scuttle removal.
Thanks for the reply Chris, sorry not answered before, computer out of action. I think I can see whats happened. The LPG injection loom as been caught up in the mechanism. I need to strip off the scuttle to see further. Will have to be after the holiday.