Steptoe and Son S05E01 - A Death in the Family

When Hercules the horse dies Albert takes to his bed. Harold buys another horse which he names Samson, but then this horse also appears to fall ill. When Albert gets up to tend to the horse he finds out that the illness is actually a pregnancy and Samson is a mare after all. Rather than call her Delilah, the name Hercules II is chosen.