This section applies if in criminal proceedings—
a statement not made in oral evidence in the proceedings is admitted as evidence of a matter stated, and
the maker of the statement does not give oral evidence in connection with the subject matter of the statement.
In such a case—
any evidence which (if he had given such evidence) would have been admissible as relevant to his credibility as a witness is so admissible in the proceedings;
evidence may with the court's leave be given of any matter which (if he had given such evidence) could have been put to him in cross-examination as relevant to his credibility as a witness but of which evidence could not have been adduced by the cross-examining party;
evidence tending to prove that he made (at whatever time) any other statement inconsistent with the statement admitted as evidence is admissible for the purpose of showing that he contradicted himself.
If as a result of evidence admitted under this section an allegation is made against the maker of a statement, the court may permit a party to lead additional evidence of such description as the court may specify for the purposes of denying or answering the allegation.
In the case of a statement in a document which is admitted as evidence under section 117 each person who, in order for the statement to be admissible, must have supplied or received the information concerned or created or received the document or part concerned is to be treated as the maker of the statement for the purposes of subsections (1) to (3) above.