Your answer has been very helpful and the second charge against the property giving rise to the IHT makes sense.
How does that work in practice ? in effect the first charge I think guarantees the IR get the the full IHT payments before any sale proceeds upon sale of the property.
Does a second charge mean borrowing the IHT value against the property from a financial instution (ie a bank), in effect mortgaging the property to clear the IHT ahead of a Sale, which would take the pressure of getting a Sale concluded?
The property is still registered to the deceased, do I have to transfer to myself or 3 siblings or is there usually a way to apply as sole Executor of the asset.