Rona Anderson (Mrs Grant) was Gordon Jackson's wife. Gordon didn't even know Rona was going to be in this episode until she suddenly turned up on set one day. She and casting director Esta Charkham had deliberately kept the whole thing a secret in order to surprise Gordon.
Susan's office block, named Century House in the episode, was in reality Globe House, Bentinck Road, West Drayton, London Borough of Hillingdon (near to West Drayton Train Station). In a reflection of Susan's charity sector employment in the programme, older people's charity Age Concern was based in Globe House early in the 21st century. The block was demolished in 2016 and replaced with a block of flats. Images of Globe House, complete with Age Concern's logo on the end wall, can still be seen on Google Street View's archive of images.