Pre 18th March 1986 DT - GWR?

I have a settlor-interested DT which is pre 18th March 1986 and the introduction of the GWR rules. Am I correct in saying that this fund is not caught by GWR regime on death of settlor whether they have subsequently received a benefit or not, provided they have not settled further gifts into trust? (i.e. income from the DT).

A pre-18 March 1986 settlement is not caught by the GWR rules unless additional property is settled after this date in which case the GWR rules will apply but only in relation to this added property.

Malcolm Finney