Defence counsel's failure to adduce evidence of a critical discrepancy between a complainant's description of an offender and the accused's actual physical characteristics — here, eye colour — can constitute incompetence occasioning a miscarriage of justice where it deprives the accused of a chance of acquittal that might reasonably have been open. A retrial rather than acquittal is appropriate where the outcome depends on the body of evidence that might emerge at retrial.
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