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(1)Evidence which is relevant to the question whether the defendant has a propensity to be untruthful is admissible on that basis under section 101(1)(e) only if the nature or conduct of his defence is such as to undermine the co-defendant’s defence.
(2)Only evidence—
(a)which is to be (or has been) adduced by the co-defendant, or
(b)which a witness is to be invited to give (or has given) in cross-examination by the co-defendant,
is admissible under section 101(1)(e).