I'd have been happy if they'd dropped Steve and Susan altogether, and continued the series with just Sally and Patrick. Oliver by episide 4 was also beginning to find his feet, and emerge from Jeff's shadow. Steve and Susan were getting pedestrian, but the series 4 episide. 'The Naked Living Room,' was Jane at her best, and the relationship between her and Oliver was really getting interesting.
The very BEST two though of Series 4 were Nightlines and Bedtime. The Dream sequences there (The Prisoner Carwash, and the Knightly Chess game) outshined any of Jeff's Siloqueys.