^ You need professional people to manage these business aspects of running the NHS to ensure that money isn't wasted and detract finance from front line staff.^
As I recollect from all those years ago our hospital administrators were highly trained and, with the formation of Area Health Authorities in place of the old hospital boards, our AHA, at least, initiated competitive tendering for Area contracts for supply of at least the hotel services side. It's not exactly a new concept or an unknown one pre privatisation of services.
I don't know about the arrangements for medical supplies but I do recall our storekeeper being very frustrated by consultants insisting on differing pieces of equipment for doing essentially the same job... He thought it very wasteful. I wonder if they can still do this?