IHTM26020 | Calculating the chargeable estate: special rule concerning spouse or civil partner exemption
From HM Revenue & Customs · Inheritance Tax Manual
Under IHTA84/S38 (2) there is a special rule where
there are two or more specific gifts to the spouse or civil partner (IHTM11032), and
Any such case should be dealt with as per the instructions at IHTM26130.