Since 26 January 2009, when the Department of Energy and Climate Change's Parliamentary Unit was set up, officials from the unit check all written answers to parliamentary questions, written ministerial statements, ministerial correspondence and debates in the Chamber to record instances where a Minister commits the Department to place a document in the Libraries of the House. The Parliamentary Unit then arranges this and maintains an electronic record.
Prior to 26 January 2009 this activity was undertaken jointly by the Parliamentary Units of BERR and DEFRA.