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The Office of the Parliamentary Counsel

The Office of the Parliamentary Counsel

The Office of the Parliamentary Counsel (OPC) is a non-ministerial department within the Cabinet Office and employs specialist government lawyers who draft all government bills presented to Parliament.

The Office of the Parliamentary Counsel converts departmental policy instructions into legislative text that is clear, workable, and designed for enduring use. Subject to parliamentary examination, its output maintains the rule of law by reconciling government intentions with principles of judicial enforceability.

The Office of the Parliamentary Counsel publish guidance about the drafting of legislation, produced by the Office of the Parliamentary Counsel for members of that office.

The Legislative process: taking a bill through Parliament is an overview of the process by which bills become law.

History and Establishment

The origins of the Office of the Parliamentary Counsel (OPC) lie in the mid-19th century, when demands grew for standardised legislative drafting to address inconsistencies in government bills.

Prior to 1869, bill preparation was inconsistent: some were drafted by the Home Office counsel for multiple departments, others by independent counsel or departmental officials, resulting in variations that affected the coherence of the statute book.

The OPC was established on 8 February 1869 by a Treasury Minute as a two-year experiment to settle all departmental bills and draft other government bills (excluding those for Ireland and Scotland). Henry Thring was appointed as the inaugural full-time head, with one assistant. In January 1871, a further Treasury Minute made the arrangement permanent, commending Thring’s improvements to bill preparation.

Initially part of HM Treasury, the OPC expanded gradually with rising legislative demands. By 1901, it comprised one Parliamentary Counsel, an assistant, and support staff. Additional Parliamentary Counsel were appointed in 1914 and 1930. By the 1960s, the office had grown to 16 lawyers and support staff.

In 1969, the OPC transferred to the new Civil Service Department and adopted its current name. Following the department’s dissolution in 1980, it became part of the Cabinet Office, where it remains.

Role and Functions

At its core, the OPC drafts all government bills introduced to Parliament, engaging from policy inception through to enactment. This iterative process involves close collaboration with departments, refining drafts to ensure coherence and workability.

Beyond bills, it prepares amendments, reviews subordinate legislation amending primary Acts, and advises on parliamentary procedure and constitutional matters. A dedicated team partners with the Law Commission on reforms and consolidations.

The OPC also fosters legislative excellence through training for Government Legal Department lawyers and publishing guidance, such as the 2022 Common Legislative Solutions guide on penalties and policy devices.

Its counsel, qualified barristers and solicitors, prioritise “good law”: necessary, effective, coherent, and accessible statutes that withstand scrutiny.

Structure and Operations

Headquartered at 1 Horse Guards Road in London, the OPC operates as a nimble unit of 46 counsel and 7 support staff, led by the First Parliamentary Counsel, currently Jessica de Mounteney.

Email : [email protected]

Telephone : +44 (0)20 7276 6586

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[post_title] was last updated on the 2nd June 2026

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