A Perfect Christmas Episode aired Dec 26, 1974

Harold wants to go to Switzerland for Christmas whilst Albert, as usual, prefers Bognor, though he is persuaded to go provided they sail, rather than fly. However he has no passport and when Harold finds his birth-certificate in order to get him one, it turns out that Albert is the illegitimate son of the muffin man and the picture of his supposed father is really Gladstone. At customs Albert's new passport is accepted but Harold's is a year out of date, so Albert happily goes on the holiday alone, unaware that Harold has actually cooked a scheme allowing him to spend Christmas with his girl-friend - in Bognor.