Released on DVD with "The Remorseful Day".
This wasn't a formal broadcast episode, but more a straight to video/bonus dvd documentary "clip show" retrospective on the character.
Original production partner Central Independent Television, with Zenith, were later acquired by Carlton Television. Carlton's Home Entertainment division, "Carlton Video", in turn produced this home video documentary. Carlton eventually merged with Granada Television to form itv plc, later renamed itv studios. The hd restoration version of the series retro-fitted the copyright holder to itv studios, but some broadcasters, streaming services, and physical home entertainment copies, maybe still be using one of the earlier (original) copyright holders names.