HM Treasury's independent Gershon Review of Public Services "Releasing Resources for the Frontline" (2004). Gershon claimed "...efficiency gains of over £20 billion in 2007-08 across the public sector have been identified and agreed" (4%). The Work Foundation's response "Whether this challenge can be met will test the capabilities of ministers, public service employers and trade unions".
An earlier millennium Treasury comparative best practice study suggests potential savings of 35% are possible, with an additional 17% if public service investment was as efficient as the private sector. This could eventually release £266 billion per year (£409 million per day, at 2007 prices) in tax cuts.