This term says that a fundamental term of the contract may be changed by agreement between the landlord and contract-holder but says there are limitations on the fundamental terms that can be changed.
Mae'r teler hwn yn dweud y gellir newid un o delerau sylfaenol y contract drwy gytundeb rhwng y landlord a deiliad y contract ond bod cyfyngiadau ar y telerau sylfaenol y gellir eu newid.