"So far as we can determine the rationale of Parliament, the policy was to treat the offence as requiring a minimum term unless there were exceptional circumstances, not necessarily because the offender would be a danger in the future, but to send out the deterrent message to which we have already referred. The mere possession of firearms can create dangers to the public. The possession of a firearm may result in that firearm going into circulation. It can then come into possession of someone other than the particular offender for example by theft in whose hands the firearm would be a danger to the public. Parliament has therefore said that usually the consequence of merely being in possession of a firearm will in itself be a sufficiently serious offence to require the imposition of a term of imprisonment of five years, irrespective of the circumstances of the offence or the offender, unless they pass the exceptional threshold to which the section refers."
"To relieve the court of its duty to impose a life sentence under section 2(2), however, circumstances must not only be exceptional but such as, in the opinion of the court, justify it in not imposing a life sentence, and in forming that opinion the court must have regard to the purpose of Parliament in enacting the section as derived from the Act itself and the White Paper 'Protecting the Public' which preceded it."