Legal and governmental sources :
Most of the legal english sources are in Latin or French. There is a good sample on the Internet Medieval Sourcebook, such as the Dialogue of the Exchequer (end of the 12th century), or the De Legibus et consuetudinibus Angliae attributed to Bracton (ca. 1210-1268).
With regards to the English documents, there is an anthology of chancery records from the 15th century in the CME, ed. J. H. Fisher, M. Richardson and J. L. Fisher, 1984.
Varia :
• Ordonnances and documents concerning the English guilds in the 14th and 15th centuries, CME, ed. T. Smith, 1870, rep. 1963, with an introduction (some texts are not in English).
• Records of the diocese of Lincoln, 1450-1544, CME, ed. A. Clark, 1914.
• Rules of Saint Claire and the order of Penitents (15th century), CME, ed. R.W. Chambers, 1914.
Anthology of English wills, 1387-1439, CME, ed. F. J. Furnivall, 1964, with an introduction.
Norfolk wills, from the project Virtual Norfolk (2001).
Letters of the Paston family, part 1, CME, ed. N. Davis, 1971.
A page of Luminarium is dedicated to the letters of this gentry family, which constitue the most important group of letters from the 15th century.
Letters and papers of the Stonor family, 1290-1483, CME, ed. C.L. Kingsford, 1919.
The Stonor were another gentry family from the end of the Middle Ages.