IHTM25382 | Gifts with reservation: Notional transfer
From HM Revenue & Customs · Inheritance Tax Manual
For the purpose of deciding whether the asset qualifies for business relief on the notional transfer by the donee at the time of the GWR charge
treat any period of ownership by the donor prior to the gift as ownership by the donee for the purposes of the ownership test (IHTM25301), FA86/SCH20/para8 (2) (a) , and
if the donee dies before the time of the GWR charge, for the period after the donee’s death treat the donee’s personal representatives or beneficiaries of the GWR property as the donee, FA86/SCH20/para8