In Sickness and in Health S04E04 - Episode 4

Alf and Mrs Hollingbery are Preparing for a trip to Australia to meet her rich brother, in the hope that he'll lend them money to buy their house cheap off the council once they are married. Alf, ever the romantic, Persuades Arthur , as best man, to go with them, so he can have someone to talk to. (Mrs Hollingbery 's company doesn't count). It could also have something to do with the fact that Alf is terrified of making the trip.