Personal Injury Trust - SDLT

A colleague in my conveyancing department has just raised a question about rates of SDLT for two properties being purchased by the trustees of a PI Trust.

One of the properties the beneficiary will be residing in and the second property will be an investment property.

Is it right to assume that the primary residence of the beneficiary will be taxed at the lower rate whilst the investment property will be taxed at the higher rate of SDLT? Any assistance would be much appreciated.