IHTM30111 | The settlor: definitions
From HM Revenue & Customs · Inheritance Tax Manual
The general definition in is supplemented by which states that where more than one person is a settlor in relation to a settlement and the circumstances so require, shall have effect as if the settled property were comprised in separate settlements.
Under the trustees of a settlement are regarded as not resident in the United Kingdom unless the general administration of the settlement is ordinarily carried on in the United Kingdom and the trustees or a majority of them (and where there is more than one class of trustees, a majority of each class) are for the time being resident in the United Kingdom.