If contact could not be made with an address, interviewers would carry out Knock to Nudge (KtN) at the address to try to obtain a phone number.
Os na fydd eich gwestai/gwesteion yn dychwelyd pan fyddwch yn eu disgwyl ac na allwch gysylltu â nhw ar ôl ceisio gwneud hynny sawl gwaith, dylech ffonio’r heddlu ar 101 i ddweud eu bod ar goll.