Inheriting an ISA - distribution of a deceased ISA

The ISA is valued at date of death for inheritance tax purposes; once the administration of the estate is complete, if stock is to be transferred to the beneficiary (and beneficiary is not a spouse/APS transfer) - can we confirm the book cost that should be attributed to the beneficiary. Should the book cost be probate value OR market value of transfer date?

Hi,
Please contact the Inheritance Tax general enquiries team:
Inheritance Tax: general enquiries
Thankyou