Whilst I'm not in favour of the Government's plan toforce all schools in England to become academies, I do believe thjat there is a place for loosening the strings that Local Authorities have on schools.
For instance (and this probably applies in other areas such as the NHS as well), most Local Authorites run supply consortia and schools are obliged to purchase books, stationery, etc. from these. My experience is that the prices charged by these consortia are over the odds, and therefore a greater proportion of a school's budget is spent on such things than need be. I suspect that, even now, there is a comparable monopoly in terms of energy supplies, phone & internet supplies, maintainance and decoration contracts, etc. In some cases, this may result in cheaper rates based on bulk purchasing/availability, but not inevitably.
I believe that individual schools ought to be able to source equipment and services from wherever they wish - which is one of the things in which academies are different to Local Authority schools.