Thanks again, Cando, I will investigate further through the links you have provided. Hannah outlived her husband by 30-odd years and was buried with a sister, so Charles must be somewhere else.
Not knowing that wonderful Rootschatters would be able to give me Charles' death date, I trawled SA cemetery sites but couldn't find a mention of him anywhere. From what I know, I wouldn't be surprised if the poor man ended up in a pauper's grave.
Can't wait to finish work for the day and push on with this.
Livia