[holding answer 16 March 2009]: The Child Maintenance and Enforcement Commission is responsible for the child maintenance system. I have therefore asked the Child Maintenance Commissioner to write to the hon. Member with the information requested.
Letter from Stephen Geraghty:
In reply to your recent Parliamentary Questions about child maintenance, the Secretary of State promised a substantive reply from the Child Maintenance Commissioner.
You asked the Secretary of State for Work and Pensions, how many and what proportion of Child Support Agency cases are being manually managed. 
Figures relating to clerical cases are routinely published in Table 20 of the Child Support Agency’s Quarterly Summary of Statistics; the latest version of which is available in the House of Commons Library, or online at:
The number of cases the Agency managed clerically at 31st December 2008 was 49,000, which represents less than 4% of the total caseload.
I hope you find this answer helpful.