Personal papers of members of the Myddelton, Lloyd and FitzHugh families, including material created by them and accumulated by them that is not of a legal, antiquarian, genealogical, academic, political, literary, or ecclesiastical nature.
Records of the Denbighshire Court of Quarter Sessions, together with the legal record of oaths sworn by William Myddelton.
Records of manor courts held at Chirk, Worfield and Friern Barnet.
Papers relating to the administration of the households at Plas Power, Chirk Castle and other houses owned by the Myddelton and Lloyd families.
Valuations of estates, including details of rents, compiled with regard to actual or potential sales and purchases, and also for the purposes of taxation.
Lists of title documents and abstracts of title,
Literary works created and collected by members of the Myddleton, Lloyd and FitzHugh families.
Papers relating to the ecclesiastical activities of clergymen attached to the Plas Power household and estate.