You should provide any information in writing, and it is advised that you record this in such a way that it can be readily accessed if you need it as evidence of information sharing.
Dylech ddarparu gwybodaeth yn ysgrifenedig, a chynghorir eich bod yn ei chofnodi mewn modd y gellir cael gafael arni’n rhwydd os bydd ei hangen arnoch fel tystiolaeth o rannu gwybodaeth.