Property valuation on transfer to a child

Where do you obtain the applicable market value for a property that was transferred between family members over 23 years ago? A property was transferred in a will in 1999 and is now for sale so how do you go about getting the accurate market value for that property in 1999 so you have a figure to base the gain on for CGT calculations?
Just to follow up on this, you and the valuer would also need to be looking at the figure for this property used in the original owner's probate.
 
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