Procurement Bill [HL]

I was delighted that the noble Lord, Lord Coaker, was able to pursue some of things that I touched on. What concerns me most, particularly given what my noble friend the Minister said about the earlier amendments in this group, is that I am at a loss to understand why we need this Bill if so much of it is already set out in the GPA or in existing law. Can my noble friend explain the role of the thresholds, particularly in the provision of food to public authorities?