That it hardens up after being stood is perhaps a clue. Xantias are prone to the bottom universal on the column seizing up - a good lubrication sorts this out(*). Strut top bearings are naff and easily seize - however, this is usually accompanied by a twanging noise as you turn the steering. Other than that you've got seized bottom ball joints or track rod ends or inner joints. If the rack or pump was going I would expect that the steering might be light if you turn it slowly, but loads up if you turn it fast or when not moving. I'd also expect the pump to be noisily complaining!
* when they do this you get a very odd feel to the steering - it sort of goes tight as you try and turn, and then releases a bit, but if you back it off it will be loose to where you had the wheel before. It's a most odd / disconcerting sensation, and nearly had me in the ditch a few times till I realised what was going on.
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