Exemption/Disregard for severely mentally impaired (statutory authority - The Council Tax (Exempt Dwellings) Order 1992; The Council Tax (Discount Disregards) Order 1992)
Eithrio/Diystyru ar gyfer pobl sydd â nam meddyliol difrifol (awdurdod statudol - Gorchymyn y Dreth Gyngor (Anheddau Eithriedig) 1992; Gorchymyn y Dreth Gyngor (Diystyru Disgownt) 1992)