Missy i know this subject doesn't want to go away, but i hope this might help to put it to bed. I also don't want to step on anyone elses toes or upset any one, i am just passing on what i have read.
The practice of lime wash was banned in the 1920's on the railways, due to the fact that the lime damaged the livestocks feet, which ment less money when they were sold.
So i would say it's a safe bet to leave the white paint in the pot when it comes to highclere.