New Inheritance rate & probate adjustment

[shelbourne26]

I will shortly be paying inheritance tax (and interest!) on an inheritance from 4 years ago. Will I pay the rate applicable then: 20% or the current 25% rate.
Also will the tax computation be based on the 2005 probate valuation of the land or the recent actual selling price which is 50% less?
Many thanks.

 

[Arch2]

Rates and value will be does in place at the time of receipt of the inheritance. (Valuation date)