A person giving oral evidence in criminal proceedings about any matter may, at any stage in the course of doing so, refresh his memory of it from a document made or verified by him at an earlier time if—
he states in his oral evidence that the document records his recollection of the matter at that earlier time, and
his recollection of the matter is likely to have been significantly better at that time than it is at the time of his oral evidence.
Where—
a person giving oral evidence in criminal proceedings about any matter has previously given an oral account, of which a sound recording was made, and he states in that evidence that the account represented his recollection of the matter at that time,
his recollection of the matter is likely to have been significantly better at the time of the previous account than it is at the time of his oral evidence, and
a transcript has been made of the sound recording,
he may, at any stage in the course of giving his evidence, refresh his memory of the matter from that transcript.