The annals of Parliament are chock full of laws called "Usury Acts" that regulated the permissible rates of interest in England and the United Kingdom. These were repealed by the boringly short-titled "Usury Laws Repeal Act," 17 & 18 Vict. c. 90.

I'll edit if and when I can find an online copy of the full text of the act.

EDIT: As promised, here is a Google Books result for the Public General Statutes for 1854, the 17th and 18th year of the reign of HM Queen Victoria.

Here's the text of the Act:

'WHEREAS it is expedient to repeal the Laws at present in force relating to Usury:' Be it enacted by the Queen's most Excellent Majesty, by and with the Advice and Consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the Authority of the same, as follows:

I. The several Acts and parts of Acts made in the Parliaments of England and Scotland, Great Britain and Ireland, mentioned in the Schedules hereto, and all existing Laws against Usury, shall be repealed.

II. Provided always, That nothing herein contained shall prejudice or affect the Rights or Remedies of any Person, or diminish or alter the Liabilities of any Person, in respect of any Act done previously to the passing of this Act.

III. Where Interest is now payable upon any Contract, express or implied, for Payment of the legal or current Rate of Interest, or where upon any Debt or Sum of Money Interest is now payable by any Rule of Law, the same Rate of Interest shall be recoverable as if this Act had not been passed.

IV. Provided always, That nothing herein contained shall extend or be construed to extend to repeal or affect any Statute relating to Pawnbrokers, but that all Laws touching and concerning Pawnbrokers shall remain in full Force and Effect, to all Intents and Purposes whatsoever, as if this Act had not been passed.

The schedules that follow list Usury Acts dating back to Henry VIII. I assume that the list is incomplete since it only lasts a page and a half, but this is all the researchy time I can spare for you at the moment. If you want further reading, your local law library (assuming you're in U.S. or U.K. or India) probably has most of these laws available in bound volumes.