In some cases, though, a legislative change may also be needed to provide further clarity or to tighten the application of the provisions in question.
Mewn rhai achosion, er hynny, efallai y bydd angen newid deddfwriaethol hefyd i ddarparu eglurder pellach neu i dynhau'r modd y cymhwysir y darpariaethau o dan sylw.