Where a prisoner for whose transfer or custody a prisoner custody officer has been responsible in pursuance of prisoner escort arrangements is delivered to a prison, he shall be deemed, for the purposes of such prison rules as relate to breaches of discipline, to have been—
at all times during the period for which that officer was so responsible, and that officer may bring a charge of breach of such rules as so relate against the prisoner in respect of any such time.
Nothing in subsection (1) above shall render a prisoner liable to be punished under prison rules for any act or omission of his for which he has already been punished by a court.
In this section “prison rules”, in relation to a prison situated in a part of the British Islands outside Scotland, means rules made under any provision of the law of that part which corresponds to section 39 of the 1989 Act.