If in criminal proceedings a person gives oral evidence and—
he admits making a previous inconsistent statement, or
a previous inconsistent statement made by him is proved by virtue of section 3, 4 or 5 of the Criminal Procedure Act 1865 (c. 18),
the statement is admissible as evidence of any matter stated of which oral evidence by him would be admissible.
If in criminal proceedings evidence of an inconsistent statement by any person is given under section 124(2)(c), the statement is admissible as evidence of any matter stated in it of which oral evidence by that person would be admissible.