Looking at transmission dates for the BBC shows reveals...
Series 1 (1968) - Monday nights
Series 2 (1969) - Sunday nights
Series 3 (1970) - Wednesday nights
Series 4 (1970) - Wednesday nights
Series 5 (1971) - Thursday nights (all these and above broadcast fortnightly)
Series 6 (1971) - Sunday nights (weekly)
Series 7 (1973) - Friday nights (weekly)
Series 8 (1974) - Friday nights (weekly)
Series 9 (1976) - Wednesday nights (mostly weekly)
So, there you have it. Morecambe and Wise's glory years with the BBC were never broadcast on Saturday nights! Seems the BBC tried every night except Tuesdays and Saturdays. Quite strange to deduce the days from transmission dates and seeing what nights they were shown on!
I think you're right there gdj - I am sure it wasn't aired on a Saturday night either. It wasn't unusual for big hitters like them to have shows aired during the week. Benny Hill's glory years shows always aired during the week on ITV, for example.
Mind you - I'd rather have the schedule you outlined on my TV of a saturday night than the utter drivel that's on it now . . . and most of those shows got ratings that today's stuff could barely dream of. Not that there was much else to divert a chappy in those days!