Of course broadcasting times also help to decide if a series would be a success. I believe the first two series of Summer Wine were broadcast on a week day at 9.30pm, after the 9.00 news. It was a few years before they moved to the more familiar early Sunday evenings. Don't forget, in the early days of Summer Wine we didn't have video recorders, the internet or catch-up services. It was always "appointment to view", so if you weren't in the right place at the right time, you had to go without. Sometimes it's not what you do, it's when and where you do it.