The only potential issue in the front is that around the time when the disco came out they changed the claiper bolts from SAE to metric. If your bolts are SAE, then you will need to ream out the holes on the caliper and us the Disco/metric bolts.
In the rear you are dealing with the rotoflex...
What do you mean stuck? Diff lock or high/low? If high/low its most likely the solenoid. Pull it and seal it back up. If diff lock, the it might be the switch, look in the manual on the adjustment procedure.
IMO that would be a mistake. Dassler is one of the best in the business. He probably wasn't too excited to diagnose over the phone pro bono.
As for camber, its points to worn/shot swivel pins. Toe is the only thing that is adjustable for the purpose of alignment.
Not to mention JLRNA has been horrible with the way they have actively gone against the Defender community by petitioning against the import of 93 110's, and their active involvement in the raids and seizures last year.