Police. Archives include warrant books, over 95% of all personnel files as well as material relating to the Houndsditch murders and letters sent to the force concerning Jack the Ripper and the Whitechapel murders. Court records The court records held at LMA are dominated by one of the finest collection of quarter session records known to exist in the country. The records of the Middlesex and Westminster sessions cover both the judicial and administrative functions of the justices of the peace covering the period 1549–1971. These include sessions of gaol delivery for the Middlesex area, held at the Old Bailey until 1834. Until the 1870s and 1880s, the Middlesex justices were not only responsible for judicial matters in their area, they were also responsible for many of the functions now under the control of local governments. Such roles and responsibilities included county bridges, prisons, lunatic asylums and Feltham Industrial School. The deposited records also include Land and Hearth tax assessments, electoral registers, licensed victuallers, recognizance's, building surveyors returns, enclosure awards and maps and plans of numerous public undertakings such as canals, docks and railways. LMA also holds a number of records of the former Inner London police courts. While many of these courts date from the 18th and 19th centuries, the surviving records often only start in the early 20th century. Included in the same section are records of petty sessions, magistrates' courts and county courts for London and Middlesex. Some magistrates' courts in the London area are not covered and hold no records of the Crown Courts. Perhaps the most popular series of records in this section are the records of coroner's courts. These include the Middlesex area prior to 1889, the London and Middlesex areas from 1889 onwards and the Greater London area after 1965. Unfortunately, the survival rate of coroner's records is only about 10%. They are also subject to a closure period of 75 years as opposed to the 30 years on other court records. Diocesan records The records of the Diocese of London have been split between the LMA and the Guildhall Library. The LMA has records concerning the Consistory Court of London and the Archdeaconry Court of Middlesex. These records include probate material up to 1858, Tithe maps, Bishops Transcripts and Matrimonial and Testamentary Cause Papers. To the south of the River Thames, LMA holds records of the Diocese of Winchester including probate and