TSEM3769 | Trust income and gains: beneficiaries: beneficiary entitled to trust income - deemed income - beneficiary is effectively the owner of the property
From HM Revenue & Customs · Trusts, Settlements and Estates Manual
The terms of a trust may, in effect, confer the privilege of ownership on a beneficiary. In these circumstances the property income, including premiums treated as rent, is chargeable on the beneficiary personally.