 He falls for Kay Derrick while she is working for his mother, resulting in her leaving her job, and later has to be chased off with a hosepipe after following her home, in "Sam the Sudden".Uncle of Kay Derrick, Mr Wrenn resides in a pleasant semi-detached house in the suburb of Valley Fields, with his niece and their maid Claire Lippett.He works for Lord Tilbury, as editor of "Pyke's Home Companion".