The Act Commentary on Sections Part 4 - Sentencing Section 124:  Proposals by Lord Chancellor or Court of Appeal
582.The Lord Chancellor can propose to the Council that it prepare or revise its guidelines. If the Court of Appeal is considering an appeal against sentence or an Attorney General’s reference case, it may propose to the Council that it prepare or revise sentencing guidelines for an offence relevant to the case it is considering.
583.The Council must consider a proposal from either the Lord Chancellor or the Court of Appeal.