19.—(1) Regulations may provide that a person is not to be paid a state pension under this Part for any period during which the person is a prisoner.
(2) “Prisoner” means a person (in Northern Ireland or elsewhere) who is—
(a)imprisoned or detained in legal custody, or
(b)unlawfully at large.
(3) In the case of a person remanded in custody for an offence, regulations under subsection (1) may be made so as to apply only if a sentence of a specified description is later imposed on the person for the offence.