“... The correct approach is to have regard to the Sentencing Council Guidelines and then to ensure that the final sentence imposed is not less than the minimum sentence required by section 111 of the Sentencing Act. Further, the three year minimum term is not the starting point. [That was a reference to the 3-year minimum term applicable in that context relating to burglary.] Rather, the judge must go through the proper sentencing exercise in accordance with the guidelines and should then cross-check to ensure that the sentence is no less than the minimum term required. In some circumstances it may be significantly more.”