must provide any information requested by the provider that the relevant authority is required to keep under the regime (see record keeping) as soon as possible, except where this:
rhaid i’r trethdalwr gadw cofnodion penodol mewn perthynas â'r hawliad a’u cyflwyno i ACC yn unol ag unrhyw hysbysiad gwybodaeth a roddwyd iddo (gweler isod)