6. c. 66) was an Act of the Parliament of the United Kingdom that provided for the periodic review of the number and boundaries of parliamentary constituencies.

The Act amended the rules for the distribution of seats to be followed by the boundary commissions for each of the constituent countries of the United Kingdom.

The Home Secretary could then issue a draft Order in Council, to be approved by both houses of parliament.

[citation needed] The Act contained a number of rules to guide the work of the commissions.

This removed the Director General of the Ordnance Survey from each commission,[2] and in each case appointed a judge to be deputy chairman.