a copy of an agreement with a third-party provider of services relating to non-domestic rates may be requested, to provide details of the provider, the service being provided and its purpose
gellir gofyn am gopi o gytundeb gyda darparwr trydydd parti o wasanaethau sy’n ymwneud ag ardrethi annomestig, i ddarparu manylion am y darparwr, y gwasanaeth sy’n cael ei ddarparu a’i bwrpas