IHTM25301 | The ownership test: Introduction
From HM Revenue & Customs · Inheritance Tax Manual
The general rule is that property is not relevant business property (IHTM25141) and so does not qualify for business relief unless it was owned by the transferor (IHTM25302) throughout the two years immediately preceding the transfer, IHTA84/S106.
The general rule is relaxed in three types of situation