Just checked on Gomog site. In the Plys8 specific section there is a thread for Ignition key.
Have a look there.
It gives some tech info re the unit and some suggestions for repair/replacement. Try Rimmer Bros/RPI as suggested.....if a LR dealer cannot do it. There is also a link to a repairer who quotes £43 or refund if failure to fix.
Just read a bit more in there. Look in the Gems EFI thread.
