Just learned of an interesting website, linked below:
"The Proceedings of the Old Bailey London 1674 to 1834 -
A fully searchable online edition of the largest body of texts detailing the lives of non-elite people ever published, containing accounts of over 100,000 criminal trials held at London's central criminal court. Now available: 22,000 trials, from December 1714 to December 1759."
As you can see, they haven't quite gotten up to JA's time yet in the trials, but the site also includes historical info on crime, courts, police, London, and much more which may be of interest to Pemberleyans.