The No-Brainer
If state schools and other public sector bodies adopted more Free, Open Source Software and low energy thin-client computing they would:
a) suffer no reduction in their quality of provision and
b) save up to 90% of their total ICT costs.
They could do this without upfront costs if they used the money immediately saved from non-renewal of proprietary licences to fund investment in low energy technology.
This assertion has been made before and details of its components have been explained in previous posts. The money thereby saved UK-wide is in the order of many millions of pounds.
Few dispute this nowadays, even the FUD has all but gone, but who cares anymore?