In Sickness and in Health - Season 4 Episode 2 -

Encouraged by Arthur Alf continues to pursue Mrs Hollingbery,even going down on one knee to propose though she wants time to think. After a night in the pub a surprise engagement party is thrown for the still - undecided - couple but when Mrs Hollingbery learns that,as a husband and wife, they could buy the house for twenty thousand pounds when its market value is five times that she is quick to accept.