Three volumes of the Oxford History of the Laws of England are now key introductions to this period. Their bibliographies & footnotes should be useful tools to begin wider searches of literature.
The Oxford History of the Laws of England volume XI 1820-1914 vXI by 
The Oxford history of the laws of England v XII 1820-1914 Private Law by 
The Oxford History of the Laws of England: Volume XIII: 1820–1914 Fields of Development by Printed resources
A lot of material for this period may well be in the Law Bod's normal open shelf collections!
However, the fact that the LawBod keeps superseded editions of English law books in a Secondary Collection may be particularly useful. The shelfmarks of old editions end with (sec coll). If you wish to consult one of these editions, please just ask a member of staff for directions.
SOLO searches will find you examples both books and ebooks. Look out for the shelf marks: they may not be in the Law Bod, but in another part of the Bodleian...
The print copies of this first group are in the Bodleian Law LIbrary
Law and Society in England 1750-1950 by 
Advocacy and the Making of the Adversarial Criminal Trial 1800-1865 by 
Boardroom Scandal : the criminalization of company fraud in nineteenth-century Britain by 
Patently Contestable: electrical technologies and inventor identities on trial in Britain by Books which are in the Bodleian History collections
Industrializing English Law : entrepreneurship and business organization, 1720-1844 by 
Victorian Insolvency : bankruptcy, imprisonment for debt, and company winding-up in nineteenth-century England by Example of a book where the print copy could be requested from the Closed Stacks if preferred. Please ask a Bodleian staff member for assistance.
Broken Engagements : the action for breach of promise of marriage and the feminine ideal, 1800-1940 by George IV 29 Jan 1820 - 26 June 1830
William IV 26 June 1830 - 20 June 1837
Victoria 20 June 1837 - 22 Jan 1901
Edward VII 22 Jan 1901 - 6 May 1910
George V 6 May 1910 - 20 Jan 1936
Legislation
The opening of this period coincides with a marked improvement in law reporting.The House of Lord had led the way by appointing official reporters to record their reasoning. A succession of recognized (authorized?) reporters began covering the superior courts of law and equity from 1820. The English Reports (ER) and the Revised Reports are both available in print in the Law Bod, or online for holders of an Oxford SSO via H
The English Reports reprinted the nominate reports; the Revised Reports concentrated on "Such Cases in the English Courts of Common Law and Equity, from the Year 1785, as Are Still [as of 1891] of Practical Utility" These are available via HeinOnline, Lexis+ UK and Westlaw Edge UK for holders of an Oxford SSO and via CommonLII on the free web.
The All England Reprint volumes (available online via Lexis for holders of an Oxford SSo) have a smaller selection of old reports from 1558 onwards, including those from the Law Times Reports 1843-1975
In 1866, the Incorporated Council for Law Reporting produced the first volume of the Law Reports, and the law student branching into legal history will be in familiar territory at last!
