Gemma Jackson is a British production designer who has worked on both television and film. She worked as a costume and set designer at Half Moon between 1974 and 1975.
The photograph above shows the St Joan of the Stockyards production team, with Gemma, who designed the costumes, standing on the right.
[L to R, back row first] Unknown (possibly Chris Marsh or Robin Marsden), Guy Sprung (in bowler hat), Pam Brighton, Peter Ling, Gemma Jackson, Billy Colville, Unknown