Steptoe and Son S06E03 - Two's Company

Harold is predictably displeased when Albert announces his intention to marry again, but he is shocked when he sees that his prospective stepmother, Daphne, is a woman he went out with himself many years earlier, losing touch with her due to a misunderstanding when he joined the army. Daphne and Harold's old feelings for each other come back immediately, leading Daphne to make a hard decision and give up both Steptoe and Son.