Thanks everyone - there is lots of good stuff in here. I agree that it isn't simply a hard cost thing but a question of demonstrating that we are getting value for money, which is a much harder concept than cheapest.
To answer "are we getting value for money?" we need to understand
What we are getting
What we value
What we are using
What it is costing us
What the like for like alternatives cost
I am going to try and pull together a questionnaire of that will help us to determine the first 4. Many of your points and suggestions will feature in the questionnaire. I will let you know how I get on.
My observation for Broadband Consortia would be that in the strained economic times, schools are going to want to have more flexibility in the offering - so, if I don't want VC to day, I don't pay for it but if I want it tomorrow, I can add it as a module. If they won't offer this then school governors will do what I am doing and question the value for money. In that we are paying for more service than we need.
Thanks again