To report a failed test, contact your customer relationship manager and email LDTmailbox@wra.gov.wales to request a loss on ignition failed test result form.
I adrodd am brawf sydd wedi methu, cysylltwch â'ch Rheolwr Cysylltiadau Cwsmeriaid ac e-bostiwch posttgt@acc.llyw.cymru i ofyn am ffurflen canlyniad prawf colled wrth danio sydd wedi methu.