Antiquarian, genealogical and academic papers,
Papers relating to the history of the Myddelton family, and also matters of wider antiquarian interest, together with material used for academic and technical instruction.
Building work and land development,
Papers relating to plans for buildings and land development on the Plas Power estate.
Cash books and other account books,
Account ledgers containing itemised daily, weekly or monthly details of estate income and expenditure.
Records of the Denbighshire Court of Quarter Sessions, together with the legal record of oaths sworn by William Myddelton.
Papers relating to the administration of the households at Plas Power, Chirk Castle and other houses owned by the Myddelton and Lloyd families.
Papers relating to the ecclesiastical activities of clergymen attached to the Plas Power household and estate.
Papers relating to the service of agents, labourers, tradesmen and servants on the Plas Power estate, with particular reference to time served and payments due.
Estate management and maintenance,
Accounts of disbursements on estate maintenance, and other material relating to estate management.
Valuations of estates, including details of rents, compiled with regard to actual or potential sales and purchases, and also for the purposes of taxation.
Records relating to livestock, game, arable and general farm management.
Legal and financial records of lead, coal and other mineral workings on land belonging to the Plas Power estate, including land that at one time or another belonged to the Chirk estate.
Arranged in broad chronological order, and also by subject.
Papers relating to legal suits involving the Myddelton and Lloyd families and their estates. The cases were heard in a variety of courts, including Chancery, Great Sessions, Quarter Sessions, Petty Sessions, manorial courts baron and leet, and the Prerogative Court of Canterbury.
Letters to other members of the Myddelton and Lloyd households,
Lists of title documents and abstracts of title,
Literary works created and collected by members of the Myddleton, Lloyd and FitzHugh families.
Administrative records relating to the work of public bodies, including the Church of England but not including law courts, apparently accumulated by the Myddelton, Lloyd and FitzHugh families in the course of their public duties. Bonds and wills have been filed here because it has not been possible to separate those that concern the Plas Power estate from those that do not.