DPA 2018 requirements can be found at Data Protection Act 2018 (legislation.gov.uk) and UK GDPR requirements here: UK GDPR.
Gellir dod o hyd i ofynion DPA 2018 yma: Mae Deddf Diogelu Data 2018 (legislation.gov.uk) a gofynion GDPR y DU yma: GDPR y DU.