IHTM04344 | Estate Duty surviving spouse exemption: application to lifetime events
From HM Revenue & Customs · Inheritance Tax Manual
The relief is extended to cover lifetime events, where the interest of the surviving spouse terminates during his or her lifetime. The latter part of IHTA84/SCH6/PARA2 means that tax is not charged under IHTA84/S52 on the coming to an end (IHTM04083) of an interest in possession (IIP) (IHTM16060) in settled property if
the spouse (or former spouse) of the person beneficially entitled to the interest died before 13 November 1974, and