If the transfer occurred on a death, IHTA84/S122 (2) provides that relief will not be due in respect of any holdings
This means relief will not be due unless the holding, by itself, would have been sufficient to give control immediately before the death. In these circumstances, you may need to withdraw any relief already given. However, where the relief is at 100% it is unlikely that a claim under IHTA84/S176 will be made.