"I therefore have to consider the impact of that conclusion upon Joseph Richer, and in circumstances where he has faced up to his criminality long ago, and should in all justice be given credit for that fact. Does that amount to an exceptional circumstance relating to this offender in the somewhat unusual circumstances of this case? I conclude that it does, that it offends against anyone's sense of fairness that a defendant should be deprived of his otherwise fair entitlement to a discount by reason of the fact that his co-defendant pleaded not guilty and was disbelieved, and had no such mitigation, even less, exceptional circumstances."