We are probably talking about something different as not as "2nd hand" as I gave the impression - having spent hours on the phone to HMRC about the issue, had to get property rent valuers in, etc. Maybe depends on the nature/structure of the trusts involved.I think tax on "imputed income" went out in about 1965. Gordon Brown rammed the final nails into Miras (which its self replaced a scheme to offset the imputed income) but not retrospectively so. I don't think the recollections of @Psamathe are fully accurate, but then its second hand info anyway. The caveat, especially with Trusts, is to seek your own legal advice.
Ian