CGT or IHT on House sale

We have a house from my father's estate that was redbook valued at £625k. But then a couple of months after his death we recieved an offer of £729k and now have a deposit from the buyer. The house has a unique location so was hard to value. we are about to apply for probate. Do we 1. Pay CGT on the presumed 'increase' from £625k to £729k or 2. List the value on the probate form as £729k and pay IHT

Hi CGTCR56,
As it was valued at £625k you will pay CGT on the difference.
You will also be liable to IHT as the estate is over the threshold of £325k.
Further guidance for IHT is at:
How Inheritance Tax works: thresholds, rules and allowances
Thank you.