“ ….this provision adds nothing to the approach which the sentencer would normally take, that is, to consider all the information available to the court. …it is difficult to see how any sentencer, properly forming his judgment, would fail to take all matters of possible relevance into account. What section 229(2) highlights, however, is that it is not a pre-requisite to the finding of dangerousness that the offender should be an individual with previous convictions. A man of good character may properly qualify for this sentence”