Under IHTA84/S197 relief is available where
For a sale made outside the three-year period to qualify for relief the following requirements must be satisfied.
This means that a sale outside the three-year period to such an
authority can only increase the amount of relief provisionally
given. You do not need to include a sale at more than the date of
death value and you will not need to keep a case open simply to
guard against such a sale.
Under IHTA84/S198 (4) an acquisition under a general vesting declaration or (in Northern Ireland) vesting order should be treated in the same way where the operative date, as distinct from the date the declaration or order is made, falls outside the three-year period. This treatment should not be extended to any other form of ‘deemed notice to treat’ such as the so-called ‘blight notice’ served by the owner of property adversely affected by planning proposals and requiring acquisition of the property by the appropriate authority.
You should refer all claims for relief where there is compulsory purchase to TG in the first instance.