In Sickness and in Health - Season 4 Episode 6 -

The three visitors have a day sight-seeing,starting in a cafe where Alf defends Hitler. After Alf has rowed with a lazy lifeguard over a non-existent drowning victim,the trio take a boat trip and Alf soon discovers that he and his bride-to-be hold differing views on many things. As far as Alf is concerned,one thing is for sure though. Australians are descended from convicts and they are still not to be trusted.