" ... it is a longstanding principle that perverting the course of justice is so serious an offence that it is almost always necessary to impose an immediate custodial sentence unless there are exceptional circumstances ... That is because such actions as giving a false account of events to investigating authorities undermines the very system of criminal justice which is thereby impeded in its functioning."
"The authorities show that this type of offence requires a reflection of the gravity of the offending and the need for deterrence."
"Appropriate punishment can only be achieved by immediate custody."
"We consider that the public interest in dealing with crime of this gravity, together with the need for deterrence, significantly outweighs the detriment to the children of this offender so that an immediate sentence should have been passed. We do not view the circumstances of this case as so exceptional as to justify the course taken by the judge. In so concluding we have taken into account the fact that an experienced judge who had conducted the trial passed sentence. We have no doubt that he gave this case his usual anxious consideration. However, on this occasion we consider that he got the balance wrong. The sentence passed was in the circumstances not merely lenient, but unduly so."