The Adventures of Black Beauty, was a popular early 1970s Adventure family television series (shown on ITV, from 1972-1974), which I have been enjoying watching on DVD, this afternoon, I enjoyed watching the following episode - www.imdb.com/title/tt0505756/?ref_=nm_flmg_act_47 which featured Glynn Edwards, in the role of Sergeant Brown.
Below, you can see the TV Times listing (from February 18th 1973), for The Adventures of Black Beauty episode Foul Play.
I watched the episode 'Foul Play' starring Glynn and it's an excellent episode. Glynn is well cast in this and gets himself into a spot of bother in the middle of the episode, which also stars Mark Eden and Jennie Linden.
Would love to hear if Glynn has any memories of doing this.