IHTM35121 | Property redirected to a charity: redirection to a charity by an individual
From HM Revenue & Customs · Inheritance Tax Manual
Many beneficiaries may feel that they would like to recognise organisations that have helped the deceased or cared for them in the period prior to death. Using a variation to achieve that aim has the benefit of an IHT saving where the organisation qualifies for charity relief. Where an instrument of variation (IoV) satisfies the provisions of IHTA84/S142 you should allow exemption (IHTM11101) for bequest to qualifying charities in the normal way.