IHTM24101 | Ownership: The meaning of ownership
From HM Revenue & Customs · Inheritance Tax Manual
Ownership is considered to mean
in the case of property subject to relevant property trusts, (IHTM42165) legal ownership by the trustees
In view of IHTA84/S91, where an unadministered residuary estate includes agricultural property, a residuary beneficiary is treated as owning the agricultural property, or an appropriate share of it. (IHTM22022)