Sorry! - Season 5 (1986)

Timothy is shocked when chief librarian Endicott suggests that he takes early retirement. Inspired by sister Muriel Timothy attends the Endicotts' party to prove his usefulness and, when the family cat gets stuck a tree, Timothy shows himself to a branch librarian in the literal sense - getting his job back, though not quite as expected.

Timothy is challenged by new girlfriend, barge-dwelling Fenella, to leave home and come away with her but first he has to attend a family christening, to which he has accidentally brought a duck. The ceremony over Timothy finds that Fenella has predictably gone without him, leaving him a bizarre inflatable monster which wrecks his mother's car.

When Timothy wishes he had never been born, a Fairy Godmother makes his wish come true.