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British and Irish Legal Information Institute provides access to the reports and consultation papers thanks to the Law Commission. Browse the reports alphabetically or by year. Coverage starts from 1965.
From this page you can browse through a full listing of Command Papers and House of Commons Papers (HCPs) from 17 May 2005 to the present, where this date signifies the beginning of the 2005/06 Parliamentary session.
The UKTO service provides access details of over 14,000 treaties involving the UK. The database contains records of treaties published since 1834 and links to the texts of Command Papers published in the UK Treaty Series from 1892 to 2001.
These treaties can be found on the archived version of the Foreign & Commonwealth Office (updated to 31 December 2012). The texts of published Command Papers can also be found on the Official Documents website.