He occasionally came down to see the filming, but generally he stayed in the background. Ray Butt, the director of OFAH, told me how John had been a scene shifter at the BBC but had told him all he wanted to be was a writer. John had finally shown him a script - and that became Citizen Smith. There was a sense of family on the set of OFAH. Most of the crew had worked together for years, gradually moving up the hierarchy, for example Tony Dow had started as an assistant floor manager, was the production manager when I was playing Vicky, then became the director when Ray Butt retired.
The scripts were so well written. There were lots of little details in the scripts that you probably wouldn't notice as a viewer - recurring phrases for example, or visual incidents that were never mentioned - but they added depth and rhythm. The lines were always easy to say, which sounds a strange thing to mention, but both then as an actor and now as a writer, I know that making dialogue sound 100% natural is actually very hard.
Lovely writing, lovely man. RIP John Sullivan.