The Child Maintenance and Enforcement Commission is responsible for the child maintenance system. I have asked the Child Maintenance Commissioner to write to the hon. Member with the information requested and I have seen the response.
Letter from Stephen Geraghty:
In reply to your recent Parliamentary Question about the Child Maintenance and Enforcement Commission, 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 cases managed by the Child Maintenance and Enforcement Commission relate to absent parents in Banff and Buchan constituency. 
Latest figures show, as at December 2009, the number of cases in Scotland is 111,050; of these 1,820 are in the Parliamentary Constituency of Banff and Buchan. These figures include old scheme cases with a full or interim maintenance assessment as well as current scheme cases with a full maintenance calculation or default maintenance decision. Figures are adjusted to reflect those cases administered clerically.
I hope you find this answer helpful.