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The usual approach is either to take the middle valuation (neither the top nor the bottom) or to take a figure half way between those two.
If no agreement is made then a Court will order an independent Valuation - paid for by both of you - which will then be the value so far as the court is concerned.
In this case a compromise at £145,000 would be generous - £140,000 would be reasonable
Please ask if you need further details