Public Trustee Act 1978

any prisoner who, after conviction of any indictable offence or offences, is undergoing a sentence of imprisonment for life or for a term of 3 years or upwards or for such term as, together with any other sentence or sentences imposed upon the prisoner, has rendered the prisoner liable to imprisonment for a period of 3 years or upwards; or

a person subject to an indefinite sentence within the meaning of part 10 of the Penalties and Sentences Act 1992; or

a person directed to be detained pursuant to part 3 of the Criminal Law Amendment Act 1945;