A pal at work (the one who catalysed me in to LR ownership) has a 200TDI disco that was suffering from tight steering last weekend when I saw him and drove it. I tried the machine in a car park and when I was steering on full lock and released the steering wheel it straightened up a bit but still steered in circles (worse on RH than LH, or maybe the other way round). Also on normal driving when slipping the wheel and allowing the castor to straighten things up it didn't want to straighten up properly.
I had a good read of the LR manual and the sequence of tests it suggests seems logical. Disconnecting the drag link and suchlike to find out where the friction is coming from etc etc. The plan was to dive in to it tonight except the plan was confounded by a) Other problems with another motor and b) The LR has "fixed" it's self.
Incidentally he has modular wheels with an inch or so offset on them so the steering stops could be wound back to allow a tighter steering circle for trialling, and when I prostrated myself under the machine it's clear both spherical joints are leaky.
So, any offers as to what fault with the described symptoms would apparently "fix" it's self. I'm not a big believer in things fixing themselves btw. IME it's usually the gremlins resting. Cheers Graham