Where personal representatives are liable for tax on the value transferred by chargeable transfer made on death, the tax shall be treated as part of the general testamentary and administration expenses of the estate, but only so far as it is attributable to the value of property in the United Kingdom which—
Subsection (1) above shall have effect subject to any contrary intention shown by the deceased in his will.
Where any amount of tax paid by personal representatives on the value transferred by a chargeable transfer made on death does not fall to be borne as part of the general testamentary and administration expenses of the estate, that amount shall, where occasion requires, be repaid to them by the person in whom the property to the value of which the tax is attributable is vested.
References in this section to tax include references to interest on tax.